Not stupid at all! Has your sister tried to contact U at all? Do U live close?
Your GP is correct: some ADs do ease anxiety .......... what's to lose?
When I was depressed and anxious I was unable to walk the dog, go into the garden, answer the phone, open post ........ I never found any of the various help lines of use !
MayB whilst U R in bed practice stretching - toes first, hold relax; calves next, hold relax - all the way up the body. Try to concentrate on each muscle group, I know how hard that can be. I was supposed to practice deep breathing .........

Try to find some 'reels' which can raise a smile, ones about cats/dogs doing silly things keep me occupied for hours in this heat! This too will pass. which AD has been prescribed?