Rach, You are getting over an infection, right? I think it's worth going in to see your doc for a recheck x-ray. If you have aspiration pneumonia or a pneumonia that isn't getting better on the meds, that could cause dizziness. It could be the MG but don't assume that, ok?

You have to drink lots while on antibiotics. Dehydration can cause a low BP.

Do you have a BP cuff? If so, take your BP after lying down for a couple minutes. However long it takes for your BP cuff to inflate, subtract that from 60. Then, stand up and wait that amount of time (the time left over after subtracting the BP cuff inflation time) and then start your BP cuff. Complicated? Not really but I'm probably not saying it right. You want the amount of time standing to be 60 seconds until the BP reads.

If the systolic/upper amount drops 20 or more, you are probably dehydrated. There are other reasons for that too like orthostatic intolerance but it's the main one.

Xanadu, good catch. When I had pneumonia, my adrenals tanked. And then your BP can go down too.

Whatever is causing you to drop like a brick, I hope you will bring it up to one or another doctor!

Annie