Seems like it could be any of those drugs or none of them. Are you able to call your doctor and do a phone consult? My General Practioner lets me call in and if he thinks it's something more he'll have me come in or suggest I go my nuro. If you're unable to speak with a doctor, then I'd suggest urgent care (I find urgent care is less expensive than the emergency room depending on your insurance).

I had similar pains before I started taking Mestinon when I would walk too much or push myself, which at the time was not very much. It was a sharp pain that I could feel in my chest right between my boobs (sorry for the descirption), which I think was actually about the middle of my lung. The doctors didn't know why, but now when I reflect I think that muscle was cramping as a response to my activity.

The bloody nose could also be from various things, but you should definatley get your blood pressure checked as someone else mentioned to make sure that's not causing it. At the very least something is aggrivating your system and it should be checked out.

Note: if you are experiencing any diziness in conjunction with those symptoms, then you definately need to go to urgent care pronto (don't drive yourself).

Take care.