WHOA. ......... stop hating yourself. The body doesn't get where it is suddenly ;-). When MinL wanted to lose weight, she weighed everything she was allowed the evening B4. Butter etc. on a separate saucer, at the end of each evening if the saucer was empty she knew she had eaten her limit for the day. It worked. And she kept the weight off.
Perhaps someone at the local Gym could give advice. Getting advice from a physio about the knee will help, did U have the area X-rayed at the time? I hate exercise other than walking, even cycling takes effort - avoiding potholes for starters
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MinL was always active and cooked food from scratch. Have a good look at your diet: make notes as to what you eat and drink and when; for 3 days/nights. Putting it down on paper reminds us exactly what we do with food in the day. It's surprising how many snacks might creep in.
Don't despair. If you don't buy it you can't eat it.
Some foods can encourage constipation. Also changing eating habits can make the bowel slower or faster
. If my bowel is slow I stop my medication for 24 hours which seems to help.