Any experiences/insight out there for how to balance MG and migraines without getting yourself killed in the process?

My doctor prescribed Sumatriptan to help with recently recognized migraines. One came on last night, I took the rx and it really helped the migraine and quickly. Unfortunately, I got the crap scared out of me because I reacted badly to it. Feeling weak from the MG already, within minutes of taking the Imitrex my throat felt like it was collapsing, my tongue started tingling and my body felt flushed. Fortunately, it only last about 30 minutes, during which I was praying and wondering if I should go to the ER. I tried to calm myself down and just fell asleep instead - felt so trapped. Being alone in the house with my 9 year old, wondering if my throat is about to close up completely, and too weak to do much was very frightening.