I'm just coming off of a slump, and I think I know how you feel. My worst was when I dropped from my previous high of 33 all the way down to 25.
My advice is to take 5-7 days off. Wait until your motivation has changed from "I want to break this slump" to "I want to play Dominion." If you're like me, it's not really about the rating, but it's about proving to yourself that you're a good player. You are, but when you're frustrated about a slump, there's a little part of your brain that screws with your carefully tuned risk/reward intuition. This makes your play worse, so you make mistakes that you otherwise wouldn't.
By taking some time off, you let the dangerous frustration fade away, and you give your brain some time to process the patterns. Maybe still read the forums to keep the game in your mind. Yeah your rating will sink a little more, but that's just the uncertainty rising--it drops away anyway when you start playing again, and heck even your skill rating will go back up that little bit faster.