Heart Skipping Beats Up To 300 Times A Day?

So, sometimes my heart will skip beats and flutter multiple times a day. It will usually beat fine, then kinda "skip" or beat a little earlier than it's supposed to, stop for a second, and beat hard then resume regulary. It has done this up to 300-400 times i day. I swear. I was about 15 or 16 when it started doing it, and that's when it was doing it almost every other second. It was really scary. Anyway, it'll do it on occasion still. Like say, every few months it'll start doing this for a few days to a week, not 300-400 times a day, but maybe about 50 times a day. Then it'll stop. Is this dangerous? I've gotten an ekg and they didn't say much about it, just referred me to a cardiologist. I'm 19 now, 5'5" and about 154 pounds. I have anxiety and depression. I took Klonopins for about a month (april 2011), then stopped. I was prescribed Celexa, but never took it. I'm a very VERY heavy drinker. Like around 12 beers a day, or a 750 ml bottle of tequila a day. Could drinking have to do with it?
It started when i started drinking at 15. I didn't drink as heavily then though. I started drinking heavily at 16 and 17 and REALLY heavily every day when i graduated January 2010. I also had high BP from drinking, in the range of 140/90, it also would beat very hard to where it would rock my body at times. Since i have gotten pregnant (May 2011), ive completely stopped drinking, BP is down to around 110/60 on average, lost 10 pounds, and heart hasnt been skipping much, it did for a few days buut that was it.