Are you able to take Ibuprofen for pain and swelling? You could try heated neck wraps or try topicals from the store for your back. I would talk to your doctor if you haven't already. I definitely know how annoying those can be.

They also have light braces/straps that you can wear under your shirt to help with correcting posture.

I found quite a few sites by just googling things. I naturally slouch and I need to improve my posture as well. Good Luck Pillow.