Hi Spiffikeen.
I am guessing most of us have hit the phen fen at one time or another. It did make me a nervous wreck, and when I spread the doses out, I couldn't sleep.
It does react with other medications, the most notorious being blood pressure meds. I would check with your doc or even the pharmacist to make sure you aren't having a cross reaction with something else you are taking.
Good luck! Hope you feel better!