I started my PCT the first week by taking 25mg of Rebound XT 3X daily for the first week. About 3 days into taking this, I began having unbearable back pain, almost reminding me of kidney stones........then, after 2 or 3 days, the pain went away, and i am now down to 25mg 1x daily, and haven't had the pain anymore? anybody heard of anything like this with Rebound XT?