[jb9]

I think losing 18 of 20 days in cash games for an experienced player when you are playing more than 1/2 hour or so a day is a sign of a problem that you need to identify.

It could be that you are making some subtle, but frequent mistakes -- it could be that the games you are playing in are too tough (or possibly just have a style that doesn't allow you to use your strengths).

No doubt you have had a run of real bad luck, but you should find out if there is something else wrong as well.

If you really can't identify a problem with your play or the games you are playing, then I'd suggest taking a break of at least several days and then coming back to 1 limit lower than what you normally play.