Your liver will have taken over some of the functions of the gallbladder once removed. But if you're unwell, its going to be under a certain amount of strain.
Regarding your tonsils, these are part of your lymphatic system. It sounds as though your lymph fluid movement may be sluggish. The only way to improve this is by physically moving your body as lymph is pumped around in this way. So you're not doing your body any favours by lying still.
It's not that hard to do quick activations. Jumping on the spot or better still, on a trampoline or little rebounder trampoline. Short bursts are better than longer ones. You only need to start with say 30 seconds if that's all you can manage.
I'd also get a full mot if you can. Tiredness and weight gain can also be a sign of underactive thyroid - as well as b12 and iron deficiency as mentioned above.
I've read that cholacol supplements are good for people with no gallbladder. It apparently helps to digest fats. Don't know if it works.
Your throat sounds very inflamed. What is the prognosis post tonsillectomy?
Tmj problems will be contributing to migraines. My jaw is out. I have massages with a very specialised massaged therapist, who has specific training. It helps.
You say you're sleeping loads and don't want to move. How much energy do you have?