Dealing with partners Anxiety?

I care about & love my SO so much. But I find it really hard to handle their anxiety. It’s not that i don’t want to help. It’s that I’ve dealt with anxiety and panic disorder, plus depression for years. Anxiety gives me anxiety. I’ve been able to cope pretty well in the past year with my anxiety but when somebody starts to tell me they’re anxious, it makes me swirl into my own anxiety. Maybe because it reminds me of how I am when i had panic attacks every day. I’m not sure. And I don’t know how to tell him that I can’t help him when he’s confiding in me.