Some pain a couple weeks out isn't unusual. Stay in close contact with your bariatric medical team about it. Food choices are really limited during these first few weeks and it can get frustrating. I resigned myself to essentially making the same few choices every day until I got to the "regular" food stage, then I started to branch out my choices and really diversify what I was eating. I started doing that in the 6-8 week timeframe. I didn't rush a bunch of new foods, but I slowly expanded from what I had been limiting myself too during the first six weeks.
I know there are times during the first 1-6 weeks where things can seem frustrating, confusing, limited, and sometimes just wrong. Stick with it. Don't sweat too much over trying to make the puree and soft food periods that interesting food wise, they are but a very tiny part of the journey and will be over soon. I know that it can seem like a long time though.
Once you get into the regular food stage, start adding in things a bit at a time and see how you react to each new food or combinations of food, then you can start putting together meals that include things you know that you tolerate well. Over time, your food list will expand and you'll have many options to choose from that will be healthy and satisfying. It can take a while to get there, though, and that's okay. It's a great opportunity to build an entirely new relationship with food and create new habits that will help you maintain your success after you've met your goals.