nah you've not blown it, as said above, changing your way of eating is long term, one day should not cause you to chuck in the towel.
More importantly, big respect for gettibg through that much meat 
Slightly less importantly, try to find some fat to go with that meat next as excess protien can be turned to sugar (some clever get will give the proper word for it, I've got a mental block other than thinking it ends with oisis atm).
You know all those pictures of Adam and Eve where they have belly button? Think about it..................... take as long as you need........................