I can't imagine what you're going through, but you may not like my response. The only way to do away with the guilt and anxiety is to:
A: Tell her the truth
B: Break it off
There is no real way around it. A week sober is a big deal, celebrate it, but you need to kill the guilt and anxiety in order to truly deal with the root cause of why you're celebrating your sobriety. Seeing you in a certain state may have hurt her enough, and trying to figure out why you chose that route may have already caused her suffering, but I don't know your story and I'm not judging, just want to give you something to consider.
Being accountable for your actions albeit the state you were in, would be a good start for growth and putting an end to the feeling. I wish you the best.