Call your doctor!

I don't like what you're saying - being so lightheaded is not normal. Please get someone to see you. Did they ever do a cardiac workup?

Pred should be helping. Are you on Mestinon?

The balance of drugs with MG is more like an art than a science. Too much can make you feel worse. But my gut instinct is that something else is going on with you. Especially given that one reaction you had to plasma.

Sometimes MG is like this. You can go through bad episodes. Did you go on that trip? Maybe that made it worse.

When I was on steroids, my pulse dropped very low. Can you check your pulse? Steroids act differently on everyone and can have weird side effects. It's always good to have a doctor check on you after you start a drug too.

I hope you will get to feeling better soon.

Annie