This anxiety and deppression is overcoming me?

ive been on anti-depressants for about 3 months., tonight ive been feelin really depressed.. the last few days ive been havin suicidal thoughts.. ive imagined hanging myself just outside my room on my balcony. Ive suffered from really bad anxiety for the last 5 and a half years and it keeps going away and coming back, im worried it has come back tonight and i really dont want to deal with the pain again. im over having to go through panic disorder and Im at a breaking point :(.. plz help me im on the brink of tears and have been like this for the last few hours and i have no one to turn too because my parents are away on a business trip and usually are never home anyway so im all alone.