I had a great experience, almost diametrically opposite yours. I was morbidly obese, over 400 pounds. I had vertical gastric sleeve done. I lost 200 pounds in the course of a little over a year.

• My cholesterol dropped like a rock, in fact my doctor recommended I add some fats back into my diet.
• My borderline diabetes went away, in fact I tended to be hypoglycemic
• My borderline high blood pressure dropped to norm
• My testosterone wen though the roof. We cut back the dosage, Changed the time between dosages but I just could not drop below a sky high amount. I eventually dropped it all together.
• I still have a schatzki ring that made me vomit when I (all to often) ate to rapidly. I no longer have issues with it
• My mental health improved dramatically, instead of sitting on my arse eating all the time I got out an did stuff - including riding
• This is 8 years later and a recent checkup was stellar, everything in the norm range

Unfortunately, I let household projects interfere with my biking and skipped a lot of rides to work around the house. Then had a double partial tear in my rotator cuff and a dislocated thumb take me out of action for almost 2 years. I gained back 50 pounds. It takes surprisingly just a few more bites of food each meal to gain back weight very slowly. I just recently started to get back into biking and am having difficulties getting up hills a lot more. I am planning to stick with it. I had also gotten very morose over the past 2 years and didn't even realize it, I just let it envelope me and accepted it as the norm. I have noticed a notable uptick in my mood since starting to walk and bike again.

So, it IS possible. Unfortunately for the OP it wasn't as big a "cure" as he had hoped. For some of us it is. Other just have different bodies and respond totally different to weight loss. A close personal friend of mine always criticized me for taking the "easy way out" by having gastric surgery. Well, here I am 8 years later still 150 pounds lighter and out doing stuff and he is confined to home after having a series of heart attacks and strokes. No one can tell if it would have been avoided by weight loss, all I know is that he sealed his fate by refusing to do anything about his weight, blood pressure and cholesterol.