I fractured my collarbone, sternum, and several ribs when I was a child and they never set properly causing my posture to be slouched because straightening my shoulder causes severe pain, I also have arthritis in my neck. My problem is I'm trying to work in my office but I can't find a position that doesn't cause me pain. I've tried following proper posture for office work but it causes my collarbone and shoulder to click and grind and get severe cramps that last for a day or two.