Welcome Beyond -
Congrats on getting off the subs and Percocet. I hope you're through the worst of withdrawals. I understand what you're saying about the different kind of pain and how tough it is at first to think about living sober.
I don't know how long you were sober before (and everyone's experience is a bit different), but after I stopped drinking it took a while to get excited about life again. What helped me more than anything was coming here and having the support of people who knew what I was going through. It's way too hard to do this on our own.
I also sought help for depression which I've had off and on since I was in my late teens. Sobriety isn't just about giving up the drink/drug - it's also about learning to live again. Be patient with yourself and keep posting/reading!