Oh honey yes call your doctor. See if he can recommend a support group of some kind Just like anyting there are people who have been there. And please don't "hate" yourself. It is not you it is just your body. I hope that makes sense.
I'm sorry that this is such a difficult journey for you, Esther. I echo the suggestion to call your doctor. Also, you mentioned waiting to call your nutritionist if gaining continues for a few weeks... I think you need to call now. There ahs to be an explanation and a remedy for what you are experiencing at the moment.
In the meantime, do you have some support here specific to WLS/gastric sleeve? This SPARKling may be a great resource and help to you: