I understand that your work is important to you, but right now it is exactly the moment when you have to give your body to rebuild. I think "everything that's done - all for the better" - is an old saying, the meaning that says that everything that happens to us should be taken lightly.
I think now this is the chance in your life when you can spend time with your son, I think that the family is very important.
I think that the decision to work on a full-time basis is the most accurate. Your doctor should be right.
I wish you to make the right decision