The one thing which has kept my head above the water in downswings is keeping accurate daily records over a span of time.
I suffered a bad downswing at one point. Even though the level I was playing at was inconsequential (financially) it completely demoralized me, as it made no sense. However, it was such a poor run, I stopped playing. Or rather, stopped playing that site for a few months (another site 'rescued' me mentally as I was instantly back to steady results).
However, I later realized I had no continuous record to review.
The point I want to make is since joining CC I have kept even more comprehensive records. Keeping those records shows how consistent my play is, yet suddenly, inexplicably I hit a brick wall....or so it feels, yet the reality is a little different.
Yes, I am on a definite downswing but I still garner results - just less of them. As long as I see I am still ahead even if marginally so, I keep playing. What I am attempting to do right now is therefore play through the downswing.
As I am presently in the middle of this run, I am not going to try to persuade anyone this is the correct thing to do. I have days when I am furious receiving so many stupid bad beats. And it might be that I ultimately decide I need a true break as others have suggested.
However, I do think it is good to really test your resolve through variance (and other possibilities) and persevere. But, it's keeping comprehensive records of play which is actually pulling me through - even if my results are less right now, they are still there to a degree.
If they dried up totally I would rethink - but I am not at that point just yet. Further, if I genuinely think something is awry at the moment (I do) then I tell myself to experiment. If I sense I will lose anyway, why not open my range in one tourney, nit it up in another and see how it plays out. If nothing else, if results do not vary (appears to make zero difference at that moment) then it does underline you are in a slump.
All that said, I still want to define how bad of a slump it really is and yet ponder whether I can play through it or not.