Exercise has helped me, though I still have some finger coordination issues. The one thing I am most careful about is carrying things. Any suitcase/computer case is either a roller or has a shoulder strap.
I have never noticed exhaustion when at the computer, only when I have used the major arm muscles.
Your computer work should allow you to enjoy a long life career. As to typing, you mentioned you got tired. You can use short cuts, program some tasks, use voice commands, and there are eye tracking devices in place of a mouse. Exercising your arms and fingers and implementing stretching might help you.
