What do my strange symptoms mean?

The first time I noticed anything strange happening was the other night, maybe a week ago on my way home from work, it was this shooting pain that started in the middle of my chest and extended out into my shoulders and arms. I found my pulse and every time my heart beat i felt a jolt of pain in my chest. This lasted for maybe 5-10 minutes, then my chest started contracting like i was going to have a panic attack (I am prone to panic attacks) and it was getting difficult to breath properly. This lasted for a good 10 minutes. When i went home i went to bed and tried to disregard it. The next morning however, i was running and the chest pain came back, so i just ran through it and tried to ignore it. I have not experienced this since. I noticed that I have been extremely tired all the time, even on days when i know i got plenty of sleep. I have been using the bathroom frequently (Im not pregnant, im on the nuvaring). I have been hungry all the time and constantly going through the kitchen trying to find something to munch on. I have been trying to eat healthier things like fruits and veggies, but ive been craving meat, and high carb things like bread and noodles. Ive also had the urge to exercise more. I have been trying to run a mile and a half every day, and keep my heart rate up for at least half an hour. This is really weird considering i used to not exercise hardly ever, and i could maintain a slim figure. Now Im starting to gain weight and I try to eat healthy, but im always hungry, Im exercising more, but its just not stopping. Does this sound like some kind of disorder you may have heard of??? I really don't want to go to the doctor, between my college courses and work, i don't have a lot of free time. I just want suggestions and maybe some at home remedy???