If you were to have gotten this feeling shortly into the cycle, like within a week or 2, I would be concerned that you had gotten "test flu". Sometimes when hormones rise quickly, the body reads it as foreign, like a virus. This can last a couple weeks. Not fun, but it's all part of it. Since this is coming on this far into the cycle, I wonder if you have maybe caught a bug. If this is not the cause, you should go in and get some labs drawn and see whats going on. Also, make sure to stay hydrated. If your urine is dark, increase water and see if that makes a difference. Tren can dry you out