I don't know when they end, but it's probably a case by case sort of thing. Have you been drinking a ton of water? I'd think that would help...
In any event, I'm happy to support you as it seems we're in approximately the same boat - I'm working on Day 17. Major problem for me over the past week has been depression and generate feeling out of it. Been sleeping a Lot.
What's helping you to hang on?