The most general advice I can give is to massage any and all muscles and find the ones that feel sore, and keep massaging them. Pain from massaging muscles usually isn't dangerous and the you'll find you had way more problems then you thought if you look hard enough.

The more specific advice is, find a really sturdy wall and a lacrosse ball and put it between your spine and your shoulder blade and look for painful spots. also massage your upper arms and chest to find points that need work. If none of that works, look around your body to find points that hurt. Hands and feet sometimes release stuff in completely unrelated parts of the body. I do fingers and toes twice a day.

(not an expert, I take no responsibility for anything ever)