Instruct: Classify Amazon reviews into positive or negative sentiment
Query: tried for fibro, resulted in terrible foot cramps

I got this from an acupuncturist for fibromyalgia pain. I used for a few days with no noticeable improvement when I began getting severe cramping in my feet, usually on the top. I have a very physical job so I was not certain of the cause but I discontinued use since I had no positive results. I recently tried Zeel again for two days and the foot cramping has returned.