Thoughts about my head ache episode

I am new to SCS and I am trying to get used to modeling my thoughts. So I had episode of headache last week and I wasn’t able to focus on my work. Now I have recurring thoughts like what if I get stressed again and I get head aches and I can’t focus on my work. I understand these thoughts are not serving me and I’m finding it difficult to come up with intentional model. How do I model this situation?