Life has become wreck because of ex(first love)..she moved on already...i need a doctor badly!!!?

ok this is serious guys...i am at a very miserable and pitiful stage of my life..i am badly(******* seriously) obsessed with my LDR ex gf(she turned 19 now) who left me 10 months ago...not a second pes by that doesnt remind me of her and i havent heard a squeak from her...i thought i moved on but its cutting me since a week and has made my life hell...every minute has become a nightmare for me and i feel worse that i cant explain in words...yesterday i came to know that she has a new guy and she is happy in her life talking to random guys...i am freaking anxious since a week missing her like crazy and feeling an urge to contact her(i wont do that because she has let me down very badly and i dont wanna sell myself short this time, also no point in contacting after almost a year)..i am still so possessive about her and cant see her talking to randon guys like this and i am stuck in the rut...i dont have any friends and she was the world for me for 2 years..this may me awkward but i am thinking to tell this to my dad and seek professional help...i may be making a mountain out of a mole but i think its logical to do this at this moment...i have my univ exams in 4 days and i will talk to my dad to not give them(no excuses, its serious! )..please advice...