Morning... after a fab start with healthy eating and swimming, it all went a bit downhill. I swam 44 lengths on Monday and 50 on Tuesday. I think I must have been dehydrated because I was very sick on Tuesday evening plus I had a bad headache. I have not swam since. I think I need to go a bit easier and build up my strength slowly. In my head i am still 20 but clearly my body is disagreeing and I am feeling the years of over eating and under exercising. Has anyone else experienced headaches after exercise?