Lowered Expectations

I had an... interesting saturday night.

It was TGP's birthday party, and most of her friends were going to a club. I had to work all day, so I was going to be late to the party. I had asked my girlfriend, if you can call her that, to drive in order that I might be able to have a few drinks. She agreed and told me she'd pick me up around 8-ish so that we might be able to get there late, but early enough to avoid the line.

Now, I'm accustomed to waiting for her. She says she'll be an hour but I know that this isn't necessarily what she means. She says an hour, but I end up waiting for nearly two. Nearly every time. I waited the customary 2 hours and wondered why she wasn't showing up yet. I had to call her and find out what the situation was.
Me: Hey what's up? Why haven't you left yet?
Her: I don't know.
Me: What do you mean? Did you not find an outfit? Do you need more time for your hair? What?
Her: I don't know. I'm just being stupid I guess.
At this point I can tell something is wrong, so I try and let her off the hook by saying that I could drive myself. Thus giving her the excuse to miss out on MY friend's birthday and not have any guilt. I just wanted to get going. She said that she'd be at my house soon, that she was leaving her place and that we'd go.
On the way to the club she tells me that the reason she was an hour late was because she was having a panic attack. Now, this is not something new for her. But it's been a year since she had one so I thought she had gotten control of it. Apparently not.
Being the attentive and concerned boyfriend that I am, I ask why. There's always a reason behind the panic attacks. She goes on a tirade about work related issues, and how things are somehow my fault, and that she doesn't really feel very good about going tonight because she won't know anyone there, even though she's met TGP before. We get into a stupid argument, with me all the while trying to calm her down. But she insults me, and I tell her to never call me that again. She then tells me that she's just going to drop me off, and to call her to come pick me up later.
Yeah right. So I get dropped off and she eventually finds her way back home, upset. We had travelled 30mins away from where we live, but she had never come this far before, and had gotten lost because she didn't know the difference between West and East on the highway.

The night itself was pretty much fun for me. I had a beer bought for me courtesy of the lyric finding contest on cranberry's blog. And because I was overtired from waking up early for work, I was a cheap drunk.

Here's my new drama though. TGP has this friend, lets call her K, who is totally cool. But totally shy. So I don't really know too much about her, except that I like what I see. TGP keeps egging me on, saying that there's fireworks and that I should go for it because this girl is solid. (Not like my current girlfriend, if you can call her that, who dropped me off at a club and stranded me.) See, I like this girl, but she only opens up when she's drunk, and it's hard to talk to someone when they're drunk because things get all muddled up. Not only that, but I'm in a relationship, albeit an unhealthy relationship, but I have to exit before I enter a new one. That's if this girl even likes what she sees, which I don't even know.
Here's the kicker, I work with my current girlfriend. We make batteries together. If I break it off with her I'll still have to see her every day at work and everyone knows that when you break up with someone the last thing you want to do is see them all the time.

My options?
Quit my job and break up with current girlfriend, pursue TGP's friend K, find a new job and get on with my life. Potentially making myself happier in the process.
OR
Keep my job, and relationship, which is going nowhere fast, and stay unhappy.

I know, the answer is obvious, but it scares me to death.