I only get it on one brand (Tokkyyo) sust. It was just last week before I noticed the pattern. Not sick after taking other tests. Last week, did 500 mg sust. , BAM sick for 2 days. Then better. Like an idiot, did 500 mg yesterday, BAM feel all weird today. With me it is only feeling really strangely achy, like a very dull headache but all over. Stomach is fine, thank god, and no fever (at least during the last episode). I was afraid it was something more serious, but it must be the sust.