Do i have Manic Depression?

I can't stop feeling suicidal i feel like i'm self destructing i have mood swings, extremely poor sleep pattern, constant feelings of suicide, i never go out the house. i've heard left-handers are more prone to being moody aswell which i'm left handed. I've been the doctors and he proscribed me some sleeping tablets but they are making me sleep too much in the daytime. I've been told that i'm agoraphobic aswell by relatives but what does it sound like from an outside point of view?