I am so glad that you are working with a therapist and have a great working relationship with them. I had a sleeve a dozen years ago in my mid 50's. I am now (well - next month !) 67 years old. I struggled with my weight my entire life. Had this been an option years before, I would have done it ! I am also a mental health professional. The problem with depression and/or anxiety is that you can be those things when you are obese, and losing weight .... well... you may weigh a lot less, but you can still be depressed/anxious. If you are using medication to help modulate your mental health symptoms, you might check how those medications work with your specific surgery. Weight loss surgery will not "make anyone happy" - but it will help you to lose weight ! Personally, I have panic attacks. They started about 20 years ago for no good reason. My weight before, during and after weight loss has had absolutely NO effect on them. Some years are better than others. If you have weight re-gain, you have to get to a emotional/mental place where you can concentrate on going back to basics of how you lost the weight in the first place after surgery.
I did experience weight gain at about 6 to 7 years post sleeve. I lost my mother, brother and father in a few year's time. I did not pay attention to what I was eating. I became a caregiver and mourned those losses. I had too much on my mind to "see" myself. When I got myself back together, and could see past all those events; I made a conscious decision to re lose the 40 pounds I put on. ( I had lost 140 ) I took a couple years to lose the weight. I realized I did not know how to maintain my weight. So each time I lost 10 pounds or so I would stop losing weight and work on maintaining THAT weight for a couple months. Once I had that down, I would lose some more. I needed to be INTENTIONAL. And make the way I eat work for me. I got back to where I was, and then kept it stable for another year. A few months back I decided to lose some more. My thought was 10 more pounds. I have lost 12. I am at one of my maintenance phases right now.
Try not to let your weight define who you are, who you want to be, and know that there is NO time line for being your best self ! Congratulations on saving up that money to give yourself the BEST way to lose weight, and to be successful.