I will turn 31 this year as well, and I can pretty much identify with everything you've said here - from the relationships and friendships to the feelings of fulfillment and vulnerability.

I think that as time goes on, we start to really learn more about ourselves and what we need to make our lives better and become stronger people. Cherish your reflections on life because they show that you are growing as a person and try to make meaningful decisions to help yourself improve.

I'm sorry you had an awful week, and I don't want to come across as treating it lightly, but life goes on and there is only one person who can drag you out of the bad vibes and situation you're in right now - and it's Oprah. You know who! :D

Pick yourself up, talk to some people you trust, you got this fellow ISTP!