Getting rid of backaches

I've always been into writing of some sort. Even before I started working from home, I used to spend 4-5 hours a day sitting at the computer just for fun and reconnecting with friends, playing games etc. Since I started working from home, I have had some sort of back pain or the other. Earlier it was because I never had a good computer chair, that provided the right support, but even now, I tend to get back aches simply because I am usually leaning forward and not sitting upright. What would be great would be to visit a Physical Therapy near New York that I used to visit when we lived in Providence, RI. That therapy really did help me a lot and I would love to go back.