Angel21 - please know that you are not alone in feeling like this, and thank you for posting your question.
For at least 8 or 9 years now I have had similar episodes, where I am suddenly crying constantly for no reason, don't want to see anyone, feel that nobody loves or even likes me, have suicidal thoughts etc.
Last week I had another episode where I basically lost 3 days - couldn't do anything but cry, felt hopeless and as though I would never be happy.
On the 3rd night I investigated mild forms of bi-polarity, and all the symptoms made sense to me. I finally chatted with a friend online at 4am, told him how I was feeling and that I needed to make an appointment with my doctor. The problem is, once you feel better, you do start to wonder if it was really all that bad...so I knew I had to have someone know what was going on, to ensure that I didn't back out of getting help.
My doctors appt is tomorrow morning - scary but necessary. Wish me luck :-)