I've read a few posts here about "post viral syndrome" and I was just wondering of anyone had more information about it or who got started their symptoms after having a virus. Two and a half years ago I had a 24 hour stomach virus and I have never felt good again. Once the virus was over with, I had constant nausea, so bad that I had to be put on prescription anti nausea medication. About 2 months later the muscle pain and everything else started. Can a 24 hour stomach virus trigger FM? This is all so confusing. I was a healthy person until I got that stomach virus.