My longest losing streak at Sng's came when I was playing the 3table 10+1 on Stars (multi-tabling 3-4 at a time).
28 in a row with no profit to show. Dropped my ROI % a bundle.
It will turn around, and it'll get frustrating until then. Just keep on your "A" game. Things will look up. This is what we have a bankroll for.
Someone mentioned moving down to build your bankroll back. It's a good idea if the hit you've taken is a good amount to your roll. If you're still in comfortable range wait it out a bit longer and see where it goes from there.
Hope things look up soon