There can be many side effects of AIs - aches & pains being probably the most common ..... I never really had any weight gain until the last 2 years with the Covid restrictions - when we were unable to get out as often as we like & do the normal exercise things that we could - so perhaps that has impacted you as well ..... I used to go out for HOURS at a time in my kayak - so the allowable 1hr exercise didn't really 'do it' for me - and I didn't get out at all & am now paying for it.
With a bit of luck, your change in dosage will make a difference .... if not, try & increase your exercise just a bit (one woman lost a HEAP of weight by just walking around her DECK until she was happy enough to go out walking in public .....)
Good luck xx