There's usually some key combo to get to recovery, but I don't know LGs at all. A ROM flash shouldn't affect recovery as that's a different partition, so it should be doable.
Don't panic, you'd be surprised what's fixable. But I think this needs someone who knows your phone. What model do you have? I suggest posting in your device's All Things Root forum, explaining everything you remember about what you did. I'd post you a link or move this thread but it's midnight here and I have to go offline.
But as I say, most things are fixable - it's just a matter of getting the question to the right people.