Here's Dr. Matthew Weiner's take on weight gain and stretching out your tool. It's a common issue. And newbies defend their position to the death: that "everything in moderation" is ok. Dr. Weiner calls it the myth of restriction and malabsorption. Love it!
This isn't magic bean surgery. They operate on our tummies not our heads. So we have to do everything we can to address the head issues that contributed to our disease while maximizing the advantage that WLS provides. It doesn't just "magically" end being a tool at the end of our honeymoon periods (anything equal to or <2 years). You still have your tool. But you have to exercise it.
I too highly recommend how healthy counseling is for us. Get a referral to your RD for post op loss care and also to a bariatric counselor. All of our surgeons wish that their patients come back to them when they are only at the 10lb regain stage rather than the 50 or 60 or 100lb regain stage.
10lbs in 3 months really needs to be quickly evaluated. It could be your choices, but it could also be hormonal of some nature and you need to have a complete work-up and evaluation. BTW, you should stick around here and get support and provide support. Your journey will help others just like you/us!!!!
Here's Dr. Weiner on the subject.