OMG Ken that sounds like a very scary experience to go through. And yes, doctors are giving educated guesses most of the time. They give good guesses considering, but still health care involves a lot of probablies and maybes.

I hope they give you a spot-on diagnosis so you can fix what's wrong, change directions, get the treatment you need, etc. so you can get on with enjoying life to the fullest. Hang in there, we do have one of the best healthcare systems in the world.