You really need to talk to a professional. Severe mood swings are a symptom of BP, but it could also be something else; physical problem, anxiety, severe pms, etc. Please atleast see a GP if a PDoc is not available. This is a great forum to vent, get advice from people who are going through the same thing you are. Maybe shift your focus from not worrying so much about a diagnosis carved in stone, but getting yourself feeling well. I know how frustrating this can be, I suffer the same problems. Mine is more anxiety/depression, these are also symptoms of BP. I hope today finds you feeling better.
We are all here to listen, encourage and share our wealth of knowledge, or lack of it at times, ha ha.
Please go see a Dr., let us know how you are doing. We all care.