My baby crying makesme unexplainably anxious

I have a 3 year old daughter and my 4.5 month old son. He just started teething. Nothing about to poke through but his dr said teeth could be shifting around because he is constantly stuffing his hands or toys in his mouth and fussing.

I was never like this with my first but with him, when he cries and fusses my anxiety is through the roof. I know nothings wrong with him that he’s just teething and uncomfortable but when it’s hard for me to settle him I literally get the feeling that I want to run away or leave him with my husband and go in the other room because I can’t stand the sound of him crying. Even if he just started. It’s like nails on a chalkboard.

I’m anxious about not being able to settle him or not being able to do things I need to do because he’s upset. I know this is normal for a baby and like I said with my first if she fussed I just dealt with it and never really cared.

How can I stop this feeling? It’s like i constantly want to crawl out of my skin. I feel like I’m not enjoying the happy times because I’m just constantly waiting for the hard times to come around.