I too have fibromyalgia and arthritis and have thought for many years that pork was causing me to have more sever symptoms after I had consumed something with pork or cooked with pork, like Italian Sauce.  Then recently I went to be tested for allergies because of an unrelated problem.  I was shocked to learn I was severely allergic to pork.  I have begun immunotherapy and tried to stop eating any pork laced product.  Now like you, I have found that if I indulge with even one bit of something with pork, I am set up for a miserable day of pain, hot swollen hands and feet that are excruciatingly painful.  One day I bought some pork chops for my husband and brother.  It was a big package and so I repacked into smaller portions to be put in the freezer.  I was shocked when within just hours my hands became swollen and had a slight rash, along with this was the horrible heat and pain which lasted for hours.  I have tried taking an antihistamine, which I do think helps.  I put a topical preparation to relieve itchiness that also had a numbing agent.  That also helped.  But the intense bone and muscle pain remained.  I have read another website posting where a lady claimed to have similar symptoms as I.  Another got very angressive and then the following day depressed, each due to pork sensitivity.  One of these women claimed she has learned it was a reaction due to an allergy to  that it is the Arachidonic acid, but I am not sure about that.  AA come from corn products she claimed, but if this is true why I am not sensitive to eggs and beef ia puzzling since beef and hens are fed corn products.  That asside, it does not remove the mystery to our very strange reaction to this food product.  Some say we need to be careful of foods cooked on grills or griddles next to pork, where juiced might intermingle.  And be wary of good old Southern cooking where pork fat might be used.  I would suggest you get allergy tested as I was.  If you do the immunotherapy it could very well help.  My allergist said that 3-6 months after starting imm. therapy, one should see a big difference.  I have noticed that since starting this therapy, I have been more achy every day, but am also sure if it is possibly due to weather conditions this year.  Which ever I have had a terrible pain season.  But it would make sense that the immuno therapy could do this since they use live allergens to make the immno product.  But if he is right and in time I will no longer have this condition it will be well worth it.  Should you not test possitive for a pork allergy, you could simply have a food sensitivity.  This does not mean that a food sensitivity is any bit better than an allergy.  I have a dairy sensitivity and this one is really hard.  Plus my symptoms are worse than the pork.  Not only does it cause me to have the same symptoms as the pork, but  gastrointestinal upset and I also get extremely tired and go into almost a comma like sleep for over 10 hours. This is with in an hour after ingestion.  Milk products are in so many more foods, and I was a big lover of cheese.  But it is simply not worth eating it and having to suffer that way.  And lest I forget, Peanuts and Shellfish are close runners up on the big bad list.  One last big thought.  Have you been tested for possible thyroid problems?  I had noticed this kind of hyper sensitivity once before and that was just before I learned I am hypothyroid.  Since being treated my symptoms tamed way, way down.  Back then it was mostly shell fish giving me the problem and more mildly the pork and milk.  Recently I have noticed that I think my thyroid meds are off because, I have many (MANY) hypothyroid symptoms.  I have made an appt to see the endocrinologist.  Thyroid disorders and embalances can cause many such problems.  A Pain Specialist / researcher said, that when attempting to help FMS patients with pain the first thing they do is to rule out any thyroid imbalances.  The Thyroid, is really like a master gland, and when it is not in balance, it affects other hormones, glands, organs, and body parts through out the whole body becomes out of wack.  I was so glad when I heard this to know I had already lined up this appt. and hopefully just tweeking my meds willl help to stop this horrible sensitivity / allergy.  Best of luck to you.  There must be many others out there that just don't have any idea yet what is going on.  

I am only 22 years old and I'm actually having similar symptoms. But I don't have fibromyalgia.

I have chronic anxiety and depression.

I ate pork yesterday and today, after taking a nap, I suddenly felt ridden with pain all over my body, especially my legs. It seems that pork, which in Ayurveda has toxins that increase vata, pitta and kapha, is so toxic that it can have measurable effects on other conditions that are based on excess of kapha and vata like depression and anxiety, respectively. This is amazing... I may never eat pork again.