RE: AAARRRRGGHHHH! I'm venting - UPDATE
Hi, Lorrie - glad to hear it's "only severely sprained" - like that's a whole lot of fun.
A couple of suggestions / thoughts:
It might be your doctor meant 3 weeks off of impact-oriented, weight-bearing exercise (can you spell C-A-R-D-I-O?). If so, and it's only weight-bearing exercise you need to avoid, I'd suggest quickly buying an Aqua Jogger and hitting the pool's deep end for some zero-impact deep water workouts. There's a thread on that subject that happened this week (and that your Genios A-Jock Who Cant Spel) contributed to; do a search for "Aqua Jogging: Anyone Tried That?" and you'll get some good ideas. Also, use the time to target the upper body and core muscles. I can't believe a sprain would mean ALL exercise is contraindicated, only the leggy closed-chain stuff.
Also, far be it from me to go against your doctors, but considering the amount of water you state you drink per day, my guess is you are suffering from hyponatremia, which is kind of the Yang to the dehydration Yin. Hyponatremia is what happens when you drink TOO MUCH WATER and flush out too much potassium, sodium and other important trace minerals from the bloodstream. And it can indeed cause dizziness. There's a very good article on the subject in my most recent issue of IDEA Fitness Journal; for you I would suggest Googling with the term "HYPONATREMIA" and see what source information you can get. There's been a great deal of discussion in professional academic journals on exercise physiology and research that indicates the Water Water 24/7 mantra is at best useless and at worst counterproductive, even dangerous.
Just my Point-Oh-Two -
A-Jock