If the toenail is significant, just go see your primary care or a podiatrist. They will cut a wedge in your toe and get the hangnail out. You do not want to go through the pain of ripping out a toenail, potentially causing an infection (which you most likely will), and may even have another hangnail later.
What did the EKG say? Normal Sinus? LVH? LBBB? RBBB? Evidence of previous infarct? A lot of times, techs will put the leads in the wrong spot. Happens all the time in the hospital. I always tell students whom I'm precepting that in an emergency, it's fine to wing it if you're in the general vicinity; otherwise you should always be as precise as possible to get the best view.
Did they give you nitroglycerin at all? If you're having chest pain (even if it may be small) that's nonstop, they should've given you 1-3 nitro tabs to dissolve.
Any history of GERD or just reflux in general?