Two things you can do here, you can either take a break from poker for a few days, then come back refreshed and tackle the $10 + 1 sng's (I would move down definately from $20 + 2 since your no longer properly bankrolled for them)

Or you can play the $5 + .50 sng's to gain your confidence back, then move up to $10 + 1 and once your back to $400, $20 + 2.

As a bonus 3rd option, you can give your money to me and ill take good care of it

Hope that helped.

-Chris