I have put on some weight in the last 12 years too due to a lower back injury (disc L5) which prevented me from exercising for a few years and thus gain weight.
Don't feel bad. I had a 32 inch waist for 12 years until I was 37 and made the mistake of eating butter pecan ice cream every weekend one summer. Then 2 years later a broken knee set me up with a cane for the rest of my life and my walking speed dropped by a third, running's impossible. Then I had to quit working 10 years ago after a stroke and with no car, I sit around at home most of the day. I'm about 175-180 pounds now, instead of the 160 I maintained until 10 years ago, with waist about 34 or 35.
I didn't have trouble with my back until 47, after trying to lift something heavy and getting my center of gravity wrong.
Oddly, people think I look better with more weight, I'd been pretty thin in the face.
Thanks and sorry to hear about your troubles. I was at my best physically in 1996. I went from about 210 pounds down to 168 pounds in about 2 months, and down to a 30 inch wasteline. I was in my early 30s then and the secret to my success was exercising every day, drinking plenty of zero calorie carbonated flavored water to subdue my appetite, and eating Boca Burgers. The bad news was that the Boca Burgers were made from soy bean, which gave me the worst gas ever. I could not stand being around myself. I tried taking Beano by the handful before and after eating a Boca Burger, which was useless.
Navigator NCC-2120 USS Entente
Stokely: In an insane society, the sane man must appear insane.
Harvey Holroyd: Where'd you get that?
Stokely: Star Trek. [leaves the room]
Harvey Holroyd: [to himself] God, I miss that show. (Source: "Serial", 1980.