welcome monica. Sorry you are struggling.
Many with MS find fatigue an issue. it sounds like you have been through alot, and it just may be time to rest up, and regain some of that stamina. Back surgery, new diagnosis of MS, new medicines, having injections everyday. its a tough adjustment. I was a wreck my first year, and many here will tell you their first year was very hard.
Pull up a chair, and grab your reading glasses. I think you will find you are in good company here.
Welcome to the club house