I also get a tension headache, and squeezing in my chest. And this is from only 5 minutes. I am in good health otherwise apart from the PCS and mostly sedentary lifestyle it has resulted in.

I also constantly have nasal congestion so I'm wondering if that could be effecting things. I use the neti pot which helps momentarily until my nose stuffs up a short time later. It runs in my family, I've always had it.