mild bipolar issue or ADD/ADHD or anxiety ?

I'm 16 and have had anxiety issues since i was in elementary school. They showed through stomach issues which i saw a dr about and he prescribed me with an old anti- depressant that helps calm stomaches. I took it for about two years and then stopped taking it because i felt ok. In 7th grade i have no idea what was wrong with me but i cryed probably every day and i would stay in my room all the time. i attempted suicide maybe 3 times and it consumed my thoughts. Now i have had more trouble with anxiety and my stomach problems are back but now ive had other things happen like feeling like your going to scream and everybody is paying attention to you and their plotting or something just crazy things and i felt like i couldnt breath. now im overly sensitive and sad and i cry over everything ( sounds like typical teenage girl stuff) but its the tiniest situations and ill be so depressed and ill panic about what people are feeling about me like if ill come to the conclusion of something that isnt even what people are actually feeling and it will bother me for long long periods of time but then ill be happy and sad and yes hormonal stuff but this time im not sure my mood swings are confusing and my anger is horrible. i have 6 year old twins and i threaten them and hit them alot and i feel like a terrible person i mean thats not right.... their kids and i cuss at them and i hate it. i hate who i am. and i dont know if its some mild bipolar issue or ADD/ADHD or anxiety or what but its causing alot of relationship problems and i just feel so horrible. I also quit things all the time very easily discouraged if that means anything and my mom has anxiety and panic disorder, post dramatic stress disorder and depression theres something else they think is wrong but cant figure out my grandpa has aspbergers and my grandma has really bad schizophrenia. so any advice would be great.