As someone who once had a solid whack to the head, I agree that it can render someone totally incapable of knowing what's best - so sorry to hear about this though, it must have been hellish, and I hope you get better soon. And yes, exercise would be helpful, I'm speaking to myself at present too as I've been in pain for five days - from lifting two bags of shopping. The untoned body will readily take the first opportunity to protest!