Worried about weight gain

I had my gastric sleeve surgery on April 12th 2016 and I could tell there was a problem right after. I couldn't keep anything down I found out I had a kink in my sleeve. They sent me to gastrointestinal doctor who dialated it with a balloon on August 12th 2016, October 20th 2016, and again on April 28th 2017 (it kinked 3 times so far and I think it is kinking again). But I made it from day of surgery weight of 254 to 162 in January 2017 I was happy as a clam. Recently I've been gaining weight I had to cut my working out quite a bit because I had to have knee surgery on may 12th 2017 I also have fallen off the good food wagon a bit and started drinking soda more then i should and cut back on water which I shouldn't have. I'm going to start back to a healthier lifestyle and cut the soda to low to none amount. I have gained almost 15lbs in the last 5 or so months and I am so scared that I will gain it all back. I need support on my journey, words of encouragement, someone to say you are going to be ok. I went to put on a pair of jeans I did fit in fine before this morning and they were a tight I broke down and cried, I feel i may be going backwards.