Jess,
Huge hugs

I started the same way, with the birth of my son, I could do nothing, I too would drag him to me as I couldn't lift him. I know how scary this time is for you but take heart, within a year of my thymectomy I was in a drug free remission and was able to raise my children. I am out of remission now due to an accident and just started back on mestinon, I forgot how it was to see without trouble focusing LOL I do not take prednisone as it makes my MG worse {very sensitive to meds}
As for work, I would not go back until you are 100%, remember that taking care of yourself and the baby takes enough out of you, add work to the mix and it is harder. If you have disibility ins. through work I would fill the papers out.
Please feel free to contact me should you want to talk, as I said I understand where you are, as I was the same exact way!
Joanmarie