Hi, Doug,
I hope Dr. Garth looks in and gives you some thoughts. Meanwhile, though, I wanted to tell you that you're not alone. My sister had RNY last year, and lost 85 lbs. But she has since regained quite a bit of it. I've been watching her eat, trying to understand what's happened, and I think I may have part of the answer.
First off, her nutritionist told her to eat six small meals a day. These days, NUTS are saying to eat three meals, and limit snacks to just protein drinks as needed to get that essential protein in.
My sis hasn't stretched her stomach, at least by what I see her eating. She will eat half a gyro sandwich for lunch, and maybe an onion ring or two. But then she eats the other half of the sandwich for her snack. If she does the same for breakfast and dinner, then she's eating about what she did before at her three larger meals. Add to this, because she can only eat small amounts, she's gotten it into her head she can have the higher calorie treats she once denied herself. She drinks milk shakes, non-diet soda, etc. She doesn't have a problem with dumping, obviously, and maybe that's not a good thing.
Anyway, you may want to take a new inventory of your food choices and see whether you're compensating for your tiny tummy by eating more often or eating more calories.
Also, support is huge, especially if you've used food as a support in the past. If you can't get into a live support group and meet with a nut right now, consider joining an online support forum like the ones at
www.obesityhelp.com. That will help you immensely.
I'm so sorry about your regain, but if you haven't stretched your stomach, then that "thin" you is still within reach. Find exercises you can do with your arthritis, and go back to focusing on lean proteins and limiting "bad" carbs.
WLS isn't a fixit, it's just a tool that hopefully makes it easier for you to eat the way you need to to be healthy. Keep up those injections and hang in there!
Hope this helps!