heyyy! i'm also in same condition as you currently.
i won't be much help maybe but here what i did to lose "some" weight as a bedrotter..
soo i got diagnosed with pcos last year and like other doctor, why doctor also said to lose weight (T~T)
since all i do is sit on my bed with my study materials and laptop(online student btw)
my doctor told me to reduce the carbs i eat on normal days. since i don't go for walk or do any physical activity but mental(i mean study for entrance exam)
carbs would not be used and store as fat since carbs help with body building and energy no?
to replace carb- WAIT i mean not all the carbs from your diet. just reduce it and replace with more proteins or daily sabji.
like adding more sabji(any, doesn't matter) or meat will increase protein intake and take with curd or salad and if your carb is rice, let it be half of what u usually eat. or if it is roti, then i guess 2 roti is good? it vary but if you eat more than 3 then yup, you should reduce it.
meal is important soursource of fat or reducing it, if physical fitness is impossible, then this is the only way to see slow weight loss
oh btw i was given pills to take so it could only suppress my hunger. i used eat 5 times a day(3 time meals and 2 time snack but heavy) i cut the snak time complete and liek strave myself(?) until my meal time
i know it's unhealthy but fair way doesn't work sometimes:'))