I kinda screwed things up with a friend and now she hates me?!?!?!?

Lately, I've been really obsessing over personal problems and I've been frustrated and stuff, and last night when I hung out with my friend I started taking it out on her by making all these snarky comments. I didn't even know how bad it was until she messages me today saying how hurt she was last night. What makes it worse is that we already had a tiff recently when I accidentally spilled something to another friend about her that I didn't know I wasn't supposed to say. Now there is this, and I feel like she is going to think I'm a terrible friend. I feel awful because I realize that no matter how upset I was about my personal problems last night I should have tried talking to her about them instead of taking it out on her. I've already apologized profusely. What else should I do? I feel like such a *****!!