I have tried many types of migraine relief and finally the imitrex injects work. Recently however, I have been getting a very hot searing pain shooting up the back of my neck, then traveling to the top of my head, immediately after giving myself a shot. My doctor has never heard of this before. Does anyone else get this effect with their shots? It goes away along with the migraine within 15 minutes, but it's just a very odd thing and I'd like to know what's going on.