didn't know exactly where to ask this question so i hope this is the right place. I am on a cycle of sust 250 and it is my 4th week running 2cc's a week. For some reason my lower back has been killing me....especially when i sit down. I have felt this pain before with other cycles i have taken but it was every so often. Now it is almost every day and it is not fun when i work outside in the heat all day. It seems to help a little when i drink water but i can only drink so much where i am working. I can drink up to two gallons and it still seems to give me problems. I am very worried it is my kidneys. Please help if you have any advice on what it might be. Thanks.