Pls help😭I want to go back to size 12

Ke

I am size 12 before now I’m wearing size 16 I don’t want that guys pls help me out I can’t deal with gym it make me sick I will end up being in hospital after hitting the gym for 3days pls guys what can I use at home aside from gym what are the things I should avoid eating and what are the things I should eat pls I really need help I can’t deal with my tommy and my arms..tnks