Good luck! Hopefully you will give some nice new tips when you go through this mess of a project ;)
If you plan on a long term career as a project manager, then yes, even with your level of experience, I would suggest getting your PMP. You can prepare yourself for the exam in one of the PMP trainingproviders like http://www.pmstudy.com/. You can do minimal prep-work to get 40 PMI® Contact Hours and apply to PMI for PMP Exam before the class begins.