It is really tough, but hang on in there. Things WILL NOT be better for anyone if you are not here anymore, your family would miss you terribly. I know that when you feel the way you are feeling right now it is difficult to see anything from anyone else's perspective, you can only concentrate on how you are feeling. The therapists advice on no drinking is obviously because alcohol is a depressive and with you the way you are right now it would make you feel lower and exacerbate your symptoms. It is all easy for me to say, although I enjoy the odd drink on medication, but I know I shouldn't. Remember exercise doesn't just mean heavy duty - the gym etc. I found that when I was at my lowest, all I could do was just walk aimlessly for miles all day. At the time I didn't realise it, but the exercise must have helped and the fresh air definitely would have done. What about taking a short walk?
What is the Dr doing for you, are you on any meds?