You shouldn't be afraid to resit the exam, in fact, your should be more confident. Why? Because now you know how the real exam looks like and what are the questions that are asked.
Now here's what you should do:
- Study the PMBOK, read it again and again and again. Remember all the questions that were in the exam and try to relate them to what you're reading in the PMBOK.
- Think the PMI way: The PMI believes in its PMBOK that there is something called the project manager's heaven, in which everything goes according to the book, and all the conflicts/issues/risks can be resolved by following the PMBOK. We all know it's not true, but our opinion is irrelevant as PMI thinks this way.
- Study Rita Mulcahy's PMP Exam Prep.
- Have faith in yourself, and remember that you can still take the exam another time.
- Make a target to resit for the exam in a month from now.
Most likely you will pass!