Why do i keep getting dull aches and pains?

Wow! Your schedule seems like quite a lot. The human body can only take so much, don't let anxiety lead you the wrong way. Yea, you can take a new engine and work it night and day until it quits. But you don't want that. Have it (you) ready for when you want it. At the speed it appears you wrote this question, I'd say you have a little something extra driving you to do this. Do you take any stimulants that are forcing you to overwork? If so, you ought to leave them for dead before they try to do the same to you.