I would advise you to weigh yourself and then check the TDEE calculator and see if your goal weight is reasonable. If not, readjust your expectations.
Another thing is learning to become immune to toxic influences and criticism. Especially if this comes from your parent. “Friends” you can shake of, it’s different for parents.
Choose the fasting window that suits you. Start slowly and adjust as you are going. 16:8 sounds good.
You can take your medication during your fasting with small amounts of leafy greens.
Actually, walking would be great. I use an online library, but sometimes I just need a reason to go somewhere and to a library I go. To browse a bit and move myself. Can you be active in the university area? What you need are comfortable shoes and will to do it. Can you use uni facilities to exercise? Are they any classes of something to make you moving, like yoga, dancing, or self-defense? Any sports or clubs like hiking or climbing?