I'm taking clen for the first time. I have 3 herniated disks in my lower back, which have not given me any trouble in a couple years. About a week after I started on the clen, I started having trouble with my back suddenly (pain, walking crooked). I was told by my dr. years ago that my back gets crooked from muscle spasms, which I see is a side effect of clen. Could the clen be causing this? I stopped the clen yesterday, and I have not been taking anything else with the clen, and I have probably not been drinking enough water. Thanks for the help everyone.