Don't regret your decision, I am 3 years out and am a totally changed person. I lost and have kept off over 120 pounds, look younger, feel younger, people can't believe the changes.
it is worth it, it is rough at first getting used to everything, but if you look at it in the positive it will get easier. Just listen to your body, if it hurts to drink Water you need to talk to your doctor, you have to be patient with everything even water. take a few sips, not gulps, it is easier that way. when you start eating, only take super small bites, eat a few bites and sit back and see how you feel. Honestly, they say eat in 20 minutes, it takes me almost 20 minutes to start getting the food in - I listen to my body and it works, it is great and you will love your new life, just go with the changes, you will NEVER eat the same again, go slow!