WELCOME... I am 9 weeks post surgery, mine included NF for gerd and a hiatal hernia repair too. I had all of the issues that you are stating.. but once I went on a soft diet at 3 weeks( broiled/baked fish was first then progressed to some well done pasta etc) it settled down. Losing weight is almost inevitable when you can only drink your meals. I have lost quite a bit but I could afford to lose it... I must say that I am so much better than I was before my surgery.
Please, if you feel overwhelmed or depressed or any of the other many emotions that you may feel during this relatively long recovery, come talk to the wonderful, warm caring and knowledgeable people on this forum.. they will always be here for you and will answer your questions to the best of their ability.. I would not be where I am in my recovery without their kind words and support.
I know that there may be some glitches in recovery.. nothing serious just a "hic-cup". I have been through a few and Couchtater, Dencha and stkitt will always be there with a supportive comment or some good advice. If you encounter a situation that you are unsure of but you don't feel that it needs to be asked of your surgeon, come here and ask.. someone will have an answer for you..
Stick around and become one of the family.. everyone here is great..
Take care and "listen to your body" it will tell you what to do or not to do.