So I was banded in sept and the weight loss has been slow too. i have had the slimy spit ups too. its when something is stuck. Carrots are totally out for me. they are just impossible. Also very disappointing is that strawberries get stuck too. the nurse suggested that it's the seeds that don't go down well. but I think I'm in the green zone now, so I don't have much hunger and that is helping me to make better food choices.
I do find that it's been a slow process to change my way of eating and also adjust my attitude. I am starting to address my comfort eating, and I have lost 7 lbs since the new year. Slow but steady I guess.
The feeling you are getting in your back sounds like its just food getting stuck on the way down. I burp a lot too if I eat too fast. We're doing a lot of learning by trial and error eh?! Take care and good luck!