Seasonal allergies? Yes. I suffer in the way of asthma. And man, my asthma has been a beee-atch.
Not only are off days good physically; they're good mentally. Sometimes a nice, occasional diversion from the usual routine gives your brain a shot of "WOW!"
Sometimes, what I do is load up on quarters and go to a local arcade and play some games. I even go and check out a few comic book stores nearby (the geek in me); anything that gets my mind going again.
Oh, but nothing beats sitting down and relaxing with a nice brew. Best way to give myself a "pat on the back" for the hard work.
Oh and W6, you're right about the fish oil. They have helped me.