I'm 69 and I had several mild symptoms after the AZ jab - my arm felt like it had been given a knuckle punch, even though I didn't feel the needle at all; I had a few aches and pains; my stomach was a little upset; I felt a bit like you do at the onset of a cold (from memory, I don't generally get colds since the kids grew up). None of this is unusual from talking to others and reading. My wife had no symptoms at all, but my youngest brother (55, but who has diabetes) did - again from speaking around age doesn't appear to come into it, although several older people have complained of cold feet. I gather that you have more severe symptoms if you've had covid already, even if it was asymptomatic.
On the RP side, after my catheter was removed last year I did get a urine infection and I had pretty bad chills with that, until I got the antibiotics. I also had blood and smelly wee, so I would definitely get that checked out.
Onto the bowels! The laxatives they gave me said not to take them if you have colitis (despite them knowing I had it) and this was right at the start of covid - couldn't get anyone to understand the issue, so I just did without and tried to eat lots of soft food. It was a problem passing for a while, but not as bad as you say. I'd speak to them about that too. You don't win any bonus points for staying silent; I finally learnt my lesson on that!