Angina (chest pain) is not completely uncommon, so don't freak out just yet. You're doing the right thing going to the doctor, so hopefully you'll be fine. I will pray for you.
I was having chest "discomfort" a few weeks ago (I definitely wouldn't describe it as "pain") and I was 2 seconds from calling 9-1-1 after doing some Googling. It was after I did some "Insanity" (I've been doing it for a week weeks after getting bored with P90X)
I was 60% it was angina (or something similar) and 40% that I was about to have a heart attack. lol It was definitely scary but since I wasn't in pain, I just waited for it to go away. Plus I'm only 27, never had a heart condition and have no family history of heart problems, so I figured that I'd be OK.
OP, since you say it's in your family, it's good that you're getting it checked out. It's probably nothing, but still....it's wise to get some professional advise. Best of luck!