Hi kpearl,
welcome to the fourm!!

It must be very scary for you not being able to breath properly.
As for your question "will I get worse?" its hard to tell. Us myasthenics are all so different as to how we progress, get better etc. Has your neurologist suggested any other medication? when do you see him/her again?
I know getting stressed out only adds to our symptoms, and saying "dont stress" doesn't help, but try to learn to manage it, it does help, its taken me a while!!!! You also have to try to know how much you can do before you are so tired/fatigued your symptoms get worse, which can be really hard if you have a family, job, just life in general!!
Please feel free to ask as many questions as you want, no matter how small they seem. All of us have been through alot, and if we can help you we would be only to happy to be able to.
you take care of yourself

redtail