I've had suicidal thoughts but there was only a period of two days where I truly considered going through it. I am an immensely lonely person--I know one person in my area outside of school and my closest family is in Texas. I'm depressed because I'm lonely and have only one friend here and because, as I get older, I just don't feel comfortable with how I look. I have social anxiety disorder which I'm battling so I can get out of my apartment without being terrified of people. Take all of that and then throw in a solid two months of disturbing dreams that were leaving me far from rested, and screaming for your mom in one of the dreams and actually screaming into your bedroom out loud for mom followed by being terrified of sleeping with the lights off because of that dream, and then you would have my mindset of when I was contemplating suicide. I was going crazy, plain and simple, and I just couldn't deal with it. So I made an emergency run to my psychiatrist so I could get off of my meds and then get new ones (which have left my dreams alone, thank god).
Since that period in time (which was about 3 or 4 weeks ago), I've gotten better and I haven't had a suicidal thought since--even a half-hearted one. Life seems so much better since that mental breakdown and I just look my dog and see her little tail wagging and then I see my parents smiling faces on Skype and I realize I could never go through with suicide. I have too much to lose doing that, and I would seriously hurt my family and I don't want that--I love them too much.
That mental breakdown saved my life.