This is a tricky situation. I believe, though, that the non-study option is probably not the best choice. Just take a short break from the GMAT and clear your mind. Once you feel rejuvinated, return to your studies!
You read the three
MGMAT verbal guides, and those are good products. But did you fully absorb the concepts? I read
MGMAT SC three times and Powerscore CR twice (in a sense) in order to feel comfortable with verbal. Just keep reading the verbal guides until you are totally comfortable with their content. For RC preparation, however, I found LSAT questions to be a good investment. Check out the LSAT SuperPrep; it has a good bit of RC and LR (CR) practice.
If you're feeling a tad desperate and truly didn't find some of the
MGMAT books helpful, maybe look into the Powerscore LR Bible and Powerscore RC Bible. However, since you already have read some decent books on these subjects, this shouldn't be necessary. Still, it might be an option worth considering.
And try to read some
GMAT Fiction. Finish at least one book a week until the test date approaches. This method helps, but in a very broad, subtle way.
And make sure that you adopt an active role in the GMATClub forums for question practice. Don't just simply answer the questions. Post your answer and defend it. Explain why your answer is correct and the others aren't. Even if this has already been accomplished by other members, put it in your own words. For
OG or SuperPrep practice in general, read every single explanation completely - even the ones that you answer correctly. It's simply not enough to do the questions, look up the answer, and move on. Test takers need to completely know the ins and outs of them.