I don't know what the overheated feeling is caused by, but I get it, too. Sometimes. Not every time.It starts in my hands. Then my face and ears get hot. I start sweating and sometimes I get clammy after the heat passes. It's so weird. I have thought it's anxiety, but then again, I'm not anxious feeling until I have that feeling. Maybe my body knows it's going to have a "severe attack" and is warning me?I go a step farther, though. Instead of the sweating going away I begin to itch all over. I break out in hives. My doctor says this is histamine releasing in my body. Now I take a daily antihistamine (zyrtec, 10 mg) and when this does happen (less frequently since I started the Z) I must take 2 benadrylls or else my eyes will swell shut and my throat will constrict. If my eyes swell shut even after the benadryll you should see me rooting around in my purse for my Epi-Pen. We don't know what causes it. I think it is anxiety related, as I know how awful and how long the pain will last. It wipes me out.