buddy, It is sad, bud GMAT is not a main thing in life. So, take a vacation for 3-4 days and sweep out all bad thoughts....I think it is just what you need. After the vacation we will be waiting for you here, and you can pm me about any quant problems that bother you.
some my recipes for quant:
1. do not waste more than 3 min for one question if there is no excess time.
2. silly mistakes: read question slowly and 2-3 times. Reread the question before pick an answer, Look out red flags: integer, positive, negative, even, non-zero, different, distinct, odd, consecutive, consecutive even
3. hard questions: choose the hardest and the most common problem, spend a few hours, maybe a day (!) but find a few ways to solve it and deeply understand its logic. I recommend to spend at least 80% of your preparation time in such way.
4. DS - the main source for time savings. Try to recognize patterns, such as: C-traps, to construct examples for E.
But, anyway, Now I recommend you take a little break and BE POSITIVE !