This is really not an answer, but an interest in your heat headaches. I, too, have these heat headaches with similar triggers. I don't even have to be doing anything. I get them if I just get too hot or too overheated while doing housework. I don't get a warning. These headaches are really difficult to get rid of - time and bed rest is the only cure I've found. But for days, I feel the blood vessels in my head and across the bridge of my nose are on fire. Do you have similar symptoms? Even my doctor doesn't understand the severity of these headaches. I will keep an eye on responses to your question regarding heat headaches in the hopes someone will have an answer.

I don't think my headaches are as severe as yours.  Mine are usually a dull ache in the top of my head that rarely becomes severe; however, it's also painful enough that it's difficult to ignore.  It's interesting to me that the problem seems to become less of a problem as the summer continues, as though my body is becoming adjusted to the heat.   Nowadays, I only take one ibuprofen and nothing else, and that usually does the trick.   Without the ibuprofen, neither bed rest or meditation or sleep will get rid of my headache.  During May of this year, I took ibuprofen 5 times.  It seems to me that I have read where heat stroke victims become more sensitive to the heat in the future, and I wonder if that might have something to do with my problem.  Although I don't remember ever having heat stroke, I believe that I have pushed my body pretty far at times in the past.   Nowadays, the only way that I can be for certain of avoiding a headache on a hot day is to keep a wet hand towel over my head while out walking.  If the day is not too warm, a mister seems to usually do the job.

I get these exact headaches. This summer has been exceptionally bad. There is a medicine called Maxalt - it melts on the tongue and you have to take it well before you THINK you are getting the headache. These headaches do not typically have an "aura" so the pain in the bridge of the nose may be too late. Sometimes I get a strange numbness along my hairline...weird I know. Again, they are very difficult to predict, so I sometimes take it early to see if it will prevent it. We'll have to see. But this Maxalt is not an expensive drug - so if you decide to try it, it shouldn't cost you much - and no, I don't work for them!

WOW,I've had the same symptpms you described. The first one I had was so bad I was delirious and thought I was having an anyurism. It was from extreme heat and humidity, trying to finish all the yard work. I am 34, female. Have always been active, outdoors, tennis, volleyball, gym 3 or 4 times a wk.This is so debilitating!! Today it was 90 and I worked outside painting (ever aware of the danger) drank electrolytes, plenty of water. But was unable to stay out of the sun and had a manageable throbbing.The pain from the first "episode" was so concentrated and severe in the right, dead-center of my head. That was 7 yrs ago maybe? When they are really severe, I also have vomitting every 30 min to an hour and my stomach hurts, my nose runs or is so congested and my sinuses and my right eye are on fire. Pressing on my nose/eye area gives some relief, if its not too bad. Sometimes I've had plenty to drink, sometimes not. The one constant is since that first horrible day if I get hot, this awful migraine begins. I have also had this 3 times from alcohol, once mixing wine and champagne, then one glass of wine(but I was upset about something and starting crying-congestion?)thirdly mixed two different liquors. I'm fine if I have 2 of the same drinks.

I, too, have the facial pain that you describe . . . the pressure and pain in my right eye, the stuffy, runny nose. This always turns into a migraine. I try to avoid becoming overheated, and avoid alcoholic beverages. Too much Ibuprofen, and a number of foods and other RX drugs will trigger this pain, too. (If I can't stop the pain, my turns into trigeminal neuralgia - severe nerve pain that lasts for days.) But the pain I have in the eye, stuffy nose, stomach, etc (that you describe) was diagnosed by a major national clinic as 'facial migraines'. I take a Relpax ASAP after symptoms begin. Check with your doctor about a RX for one of the 'triptan' medications [Relpax (my favorite because I don't get the rebound headaches), Maxalt, Imitrex, Amerge, etc. are all very good ones. Check out the pricing, some are very expensive if you don't have insurance. Also check their websites - I know Relpax offers a $10 Co-Pay Card - other brands may also. Your doctor may have samples of these products. There may be some of the old-time remedies (medications like Cafergot, Wygraine, etc) still available that your doctor can prescribe that are not as expensive.]  GOOD LUCK! With the help of my doctor I can now pretty much control my headaches. I still get them, but I can now cut them short with a lot less pain.