The pool exercise is a great idea. I did it for a while. I would lunge the length of the pool then go back. I did 40 lengths without an problems. The water takes out all of the jarring motions. I incorporated some breast stroke motions with my arms.

Pulling back hard with my shoulders helped balance out the shoulder muscles that often get twisted out of position from the head ache stress that radiates. The goal is to push the shoulder blades back and toward each other. The hunched shoulder posture is a common result of feeling poorly. This remedies it.