I've suffered with chest tightness, racing heart, can't relax, etc, for about 10 years now. The thing is I've nothing to be anxious about now, although I did for the first year or so, and I just can't stop feeling anxious. I went on Sertraline for a year about 2 years ago but stopped as the side effects were too much and anyway they didn't make me feel hugely better. It's really affecting my quality of life now and I'm exhausted in the early evening. Any advice much appreciated.