I can absolutely relate to your story. I have tended to direct my destructiveness inward rather than outward for the most part (though not always able to) so though I have destroyed some relatioinships, I've been lucky enough to keep a number of important ones. But what you describe sounds pretty bipolar to me. Only time and full evaluation will tell. But whatever the problem, there IS help.

Full self-examination is always painful, but always worth it. And you will have friends here.