Melissa,
I think many of us have been there. I have been on that edge many times. I cannot say I know what you are going through because like everything else, all is very personal and different for each individual. However, as a(as of today) human that has been around for 51 years, I have experienced that feeling more than once.
I can't tell you what to do. I can request you stick around for others and fake it till you make it. I believe we can all find a way through this. Sometimes we just need help.
I hope you take the other's advice and we see you about.
With warmth,
Joanna