Tyson, All of the medical experts I know (meaning doctors) all say that an ER is the place for a severe headache, especially a sudden one. You cannot tell by how it feels what is wrong. Because of your "thick blood" and the odd reactions you have had in the past to plasma, the ER is where you should be.

What if there is a narrowing of an artery?

You're on all these drugs, you have had odd symptoms probably not related to MG and now this severe headache. If someone else had all this going on, what would you tell them to do?

Leave it up to the doctors to decide if it's MRI time.

Annie