Is this illogical thinking?

I have a phobia of getting a blood clot. I have no clotting disorders, and no risk factors. I've been checked out numerous times, including dvt doppler ultrasound, d dimer blood tests and blood work. And its all been clear. Last few days I've been worrying about it again. I had a horrible panic attack yesterday and felt bad all day after that. A little while ago I got this pain in my side like under my armpit and behind my shoulder blade. I keep worrying over getting a clot and dieing. Am I being illogical? I'm 22 BTW