Ok So I Have Been Having A Few Symptoms, I'm

Ok so I have been having a few symptoms, I'm not one to go to the doctor until I collapse because Ieould go a lot as a kid due to "heart pains" but the doctors would just keep telling me I'm ok. I also have a paranoia about heart attacks. So I'm under a lot of stress, my diet consist of gas station sandwiches and "bistro" food. The food at work. And my sleep is lacking and this has been going on for a year now. I'm at a boot camp type school for digital art. Anyways I'm having some pinching pain in my "heart" area. My left arm has always felt weak probably due to my paranoia, I'm dozing when I wake up and at night which my friends think is from malnutrition and now I feel like a pulsing throb in the center of my wrist, not quite on the pulse but still it's just on and off and freaks me out. Also a little back I had my heart hurt and I couldn't take deep breathes, it' hurt more and more and then I felt a pop and freaked out on my coworkers. One just told me that's normal and after the pop you can breathe again. He was right so I let that slide. For the past few days I've decided to get sleep, eat right and workout a bit. So I do planks, crunches and mountain climbers in the morning for 5 min. Eat a good breakfast, go to school for 12 hrs and eat crap food there. Also my back has been hurting before all this too. And I sit at a computer all day. I know what this sounds like and that's why I don't want to bother doctors. Is my anxiety and psychical paranoias really making all this up because before this school I ate right and worked out and now I'm doing nothing. Also sorry for bugging you guys too.