Hey, headache, especially for a few days, sounds to me like parasites are dying left and right - headache is a classic symptom, so sounds like it's working.
Now couldn't you eat meat if you either cooked it really well, (which I guess you don't want to) or microwaved it for a bit, or zapped it? How about that? Use one of those zappers on it and it still wouldn't be cooked. I wonder if that would work.