Welcome, Tara, to the forum. It's great you found this place.
I hope you will read the locked pages at the top of the forum. Also, put some keywords in the search box at the top of the page to find older threads that interest you.
I'm glad you did not have gastroparesis or some of the other bad diagnoses. It's bad enough to have to have Nissen surgery. At least it is helping you! Did you have the classic Nissen or one of the partial wraps? Mine was a Toupet variety - partial wrap.
To keep from losing weight I simply ate every hour, even 20 minutes at first. Try to get enough protein, maybe eggs or cheese. Beef is way too rough and hard to swallow for quite a while.
I had pain for a long time. I can't remember exactly, but it seems now it was a month. My surgery was a bad one because I had a big hiatal hernia. A lot of people seem to not need pain meds after a few days or weeks. Ask your doctor about your particular case. We're not doctors here!
Best wishes for a great recovery. Keep on posting.