very skinny boy with chest pains and breathing problems

I am 17 yrs old, a boy, i am very skinny like 110 - 120 last time i got a check up, im like 5' 8' tall, i think i got heart problems.The problems started when i was 15 i think it was all the junkfood i eat.I would get sudden flashes of pain like thunder i would just crouch and breath slowly and it would go away it felt like stabs.When i turned 16 one night i woke up with extreme pain by the heart area every movement, every deep breath, would hurt i was gonna wake parents up but felt bad so i slowly made my way to the living room and sat down i prayed to god to forgive me for the bad i thought i was gonna die but i slept sitting down the next day i went to the doctor she said it was acid reflux and gave me pills that worked for a while. Now im 17 sometimes i take deep breaths and below my right rib next to the stomach i get a feeling like something in me is getting twisted and i just curl up and breath slowly then it goes away,also my heart feels very week and sometimes i feel pains like my heart hurts, i have trouble breathing like its hard to like i got pressure on my chest, my legs fall asleep alot,and im always tired sleepy lazzy weak,most recently i felt a very funny feeling in my heart like trapped air or something wiggling in it or pulling it out of my body i couldnt find a comftarbles position to sleep or sit or anythin it llasted like 2 weeks.

about me i havent ate vegetables or fruits since i was 5, i love junkfood and all restaurants, i dont exersice, i havent played sports since i was 12
and when i do play soccer i last 10 to 20 minutes before i have to stop and gasp for air and start coughing, and i like staying up at night and dawn and sleep morning and day i think i got insomnia.