Don't start beating your self up over this yet, Wobbers. It's natural you will experience low periods from time to time in an event as grueling as this. You just need to commit to working your way through it. OK, it's happened pretty early on which would suggest that you've not been to the pub recently. C'mon, admit it, you haven't have you? There must be a pub with WiFi somewhere nearby.
Good luck, matey, we're all behind you.