Hi, sorry you are feeling so blue
. I don't know what mg of zoloft you are taking but the dose does need to be bumped up after time. I also take zoloft and mine had to get bumped. Almost all Dr's offices have tons of samples. Mine gave my hubby his blood pressure meds for at least a year cause our ins did not cover it.
I feel your pain about the stairs.....There are 2 sets in my house--go up to go to bed and go down to leave the house and about 25 trips thru the day taking care of my puppers.
The Bed Buddy that you put in the microwave has been a Godsend. I have 2, one for the neck and another larger one that works great for the upper back or on the hips. You can even fill a sock with rice or even be more creative so it doesn't look chutzkie, but a plain ole sock will do.
Good luck and I hope you find some relief