I'm constantly living in fear of every damn thing

I have terrible, terrible anxiety. Especially health! The most ridiculous things, such as if I use cleaning products, I only use natural and only one. I never use more than 1 products (I don't mix them), I hold my breath and walk out afterwards because I'm afraid if I breathe it in, I will basically suffocate and die and the smell lingers and I start to panic. Another one was I cleaned my car and it had a bit of mould on it, so I had to clean it off but again, held my breath and now I am terrified I breathed in the spores and I am going to get problems. I am very fearful of mould. We had mould at my last place and I was so scared of it my husband had to clean and paint over it at least once a fortnight. I choked a bit on my cereal earlier, so I will now have aspiration pneumonia. I'm a terrible wreck I know but what a life. Always fearful and always terrified that I am going to be unable to breathe and die. If I get a cut, I think I will get sepsis. Tiny bit of chest pain, then I am waiting to call the ambulance. This is just ridiculous as we're all immortal. Why do I feel like I am breathless when I'm in this state. I, surprisingly never suffered a panic attack but it feels like I do, silenty.