Hi Jenny -- Stop now... and just dust yourself off and keep going. Don't wait to restart... don't quit. It is like running a race, you trip, you fall, you get up, check for injuries, dust yourself off, and start running again. The sooner you go back to ssing, the faster you'll slip into ketosis and less likely you are have much of a regain.
Please talk to your CDC about maybe going up a plan. People still have very good losses on 810 and 1000 -- maybe ssing isn't the best plan for you.
Do not beat yourself up over this... we all struggle at times.
MinnieMel