Depression anxiety anger loneliness.

I have been feeling very depressed since past couples of years.since last year, i have become very moody. I always feel low and alone nowadays no matter how many people i have with me. I have been in a long distance relationship since past 2 years and its been going downhill since last year. I have been having suicidal thoughts since past 6 months. Having trouble sleeping at night and eat a lot. Feel hungry even straight after lunch or dinner. I cannot focus on anything. I dont feel any happiness in doing things I used to enjoy earlier. I suppose maybe all this because of trouble in relationship but I'm slowly losing my mind. Even outside or at home.. I feel choke. I don't share all this with anyone beside my GF but we are already having rough times. I badly need guidance. I'm afraid I'm messing up my future