Hi mjoeb,
I agree with misterJJ2u. You should consider waiting until next year. I'm not sure if you're a woman of faith, but personally I would take this current trend as a sign that this is not the appropriate time to enter business school.
Also, it does not appear as though you are preparing for the exam very strategically. Your recent score reflects that. Personally, I compare the GMAT to a game of process improvement. Optimization (an engineering term) seeks to map out a process and eliminate all the defects in the process. Simply taking the exam (process) over and over again isn't going to improve your score (output), just as Ford running its production line the same way over and over again isn't going to increase output or decrease defects.
This is a similar approach you need to take with the GMAT. It's not a matter of if the process will work (do I have the intelligence?). To make the process work, one only needs to make a payment and show up at the test center. It's a matter of removing all the defects from the process. Maximizing your output takes intelligence, running the process is automatic; by the time you take the exam the process will already be mapped out and thoroughly tested!
The good news is the GMAT is a standardized exam. This means the process is predictable and the methods to optimize the process are usually fairly easy to pin-point, i.e. timing, knowing the fundamentals(which are limited), psychological, etc. Concurrently, the fine people of the GMAT club have analyzed nearly every aspect of possible improvement and have provided countless tools for addressing them!
As the others have said, you need to put a stronger emphasis on analyzing your weaknesses (defects in the process). There are numerous tools including error grids, GMAT-specific timers, 1000 question banks, guides, etc. to assist you.
It's also apparent the pressure of your application deadlines is getting to you and affecting your prep. As the others have said, half of the battle with the GMAT is psychological. A solid year of prep will allow you to have a life AND optimize your GMAT strategy. The good news is you have the application ready to go, so you basically have a year to just work on the GMAT. If you decide to wait, relay to the admins that you have decided to postpone your application until next year.
I would not tell them it's because of the GMAT though. Link it to some other aspect of your professional career. For example, an opportunity to increase your professional experience has been provided to you and you believe taking this opportunity will further increase the value you can add to classroom discussion as a future MBA student of x university. You can add a clause in your SoP next year explaining your scores. This will show maturity on your part, not defeat. As a future MBA, you are already learning how to make a tough business decision. This will not be the first one you will face so hang in there. Waiting a year is no big deal in the grand scheme of things.