Hi, Nettie,
I'm not quite sure what you mean by your son has been diagnosed "as Migraine and tension." Do you mean that he's been diagnosed with both Migraines and tension-type headaches? Since you listed tension-type headaches in the tags you chose, I'm going to answer you based on his doctor having diagnosed him with both.
Temperature fluctuations are not uncommon during Migraines, and can occur before the headache phase begins or during the headache phase. It's uncertain exactly why this happens, but it does.
One thing to know about tension-type headaches (TTH) is that they can trigger a Migraine if they aren't resolved quickly. You can read more about TTH in Tension-Type Headaches - the Basics.
Do you know what his Migraine triggers are?Trigger identification and management is a vital component of managing Migraine disease. One of the best tools for identifying triggers is a good Migraine diary. You can download a free diary workbook from our article Your Migraine and Headache Diary. Some of us have food triggers; some of us don't. It's advisable to determine if your son does, and an elimination diet is the best way to do that. For more information and a workbook on this, see Managing Migraine - Migraine Trigger Foods.
Absolutely, three to four headaches or Migraines a week is too many. I don't know how old your son is, but has his doctor discusses prevention with you?
If his doctor isn't able to help, it may well be time to consult a Migraine and headache specialist. It's important to note that neurologists aren't necessarily Migraine and headache specialists. Take a look at the article Migraine and Headache Specialists - What's So Special? If you need help finding a Migraine specialist, check our listing of Patient Recommended Migraine and Headache Specialists.
Please let us know if there's other info you need or anything we can do to help you and your son.
Good luck,
Teri