You asked...I'll answer. Calm down! You're just three and a half weeks out. It's normal at this point to get some pain, and even reflux. Actually, in fact, the esophagus is a dumb organ, and interprets all pain as reflux.
While during these early weeks of recovery, reflux is certainly possible, I'd guess that what you're experiencing is a reaction to overdoing it both physically and with your eating.
Believe me, I understand your fear and anxiety. I also experienced it at your stage of recovery. I was getting some reflux feelings, and was very fearful that my surgery was a failure. (I had very bad lungs, and I coughed hard and incessantly, so I was sure I'd damaged my wrap.)
Sandwiches are a no-no at your stage of recovery. Bread is very difficult to swallow and it becomes clumpy, rather than becoming a liquid consistency.
At 3 weeks post op, you need to be taking it easier than what it sounds like you're doing. I'm confident that your surgeon is correct and that your wrap is still snug and intact.
It's just that your upper GI tract has been through major surgery, and you need to understand that it is not going to be happy for quite some time. If you've been turned loose to eat "anything" at this point, be sure to choose things that can be chewed to liquid. Take very small bites and chew, chew, chew. Stay away from anything that doesn't chew up completely, and choose less spicy and acidic foods for a while. Be gentle with your healing wrap/stomach.
Laproscopic surgery is deceiving. Our outsides heal quickly and we're ready to get back to our normal activities. Still, our insides have been through a tremendous shock.
You will know when you overdo it, because your stomach and esophagus will let you know. It's important that you listen to them, and adjust your behaviours accordingly.
It takes a full 6 months for the majority of internal healing and adjustment, and a full year for the rest.
Hang in there...in time you'll be back to all your normal activities and eating. Until then, understand that your poor stomach has been through a lot, and deserves some TLC. Treat it kindly, and you'll receive kindness in return!
If yo can surrender to your recovery and follow it where it leads things will go much easier. Try not to rush things. Just go with the flow.
I'm sure if you take it easier for a while and are more careful with your eating, you'll get back to feeling better again.
Don't waste a moment worrying that you've done anything to your wrap. Believe me, I understand your concern, but what you're experiencing is very normal at your stage of recovery.
Relax, and be patient. Take it a little slower.
You've just had major surgery...