Asthma, allergies, being a slow runner, and general anxiety/sadness. Could they all be linked?

Warning: absolutely not-researched speculation ahead. May be psuedosciencey. 

I always feel a LOT better when I do the breathing exercises on my Apple Watch. 

Like, a million times better. It's amazing how much better I feel. 

And the deeper I breathe, the better I feel. If I don't expand my lungs enough, then I only feel slightly better. But if I inhale as much as possible? I feel calmer and happier, from just a minute of breathing. My anxiety lessens, and the sadness is muted, at least for a little bit. It almost feels like my brain has been starved of oxygen, just from breathing normally, once I do these exercises. 

Now it's important to note that the states with the highest depression rates are often the states with the highest altitudes. For example, Colorado and yes, Utah. 

No link has been proven to exist with this altitude and mental illness, but there at least appears to be some sort of connection. 

Now add my severe allergies and mild asthma to this list. The asthma is barely noticeable, but the allergies are awful. I am allergic to almost everything in the air, and the nurse who tested me said it was the worst case of airborne allergies that she had ever seen. I take five medications daily, with two of them twice daily, simply to breathe properly. Plus an inhaler as needed, so that's actually six. Even then, this is not foolproof. 

I don't just get itchy and sneezy -- without my medication, I am legitimately gasping for air and sometimes I get dizzy due to the lack of oxygen. My nasal passages tighten and I cannot focus on anything. Sometimes this happens even with the meds, and that's when I have to take my inhaler, usually. 

I had depression issues in California, too, though in Utah they started to follow a seasonal pattern. In Colorado it was low-grade, all the time, but not super noticeable. I was somewhat happier as a missionary, almost as though my depression had been slightly lifted the moment I got out of my mom's car. And then it returned immediately the day that I got home. Though, it's never been as bad as it was when I was 16-19. 

And of course we can't forget the generalized anxiety disorder and all the fun that comes with that.

From all this, I wonder if the persistent lack of oxygen has something to do with my depression, alongside genetics and such. 

In addition to this, I think it may be what slows me down as a runner. In high school, I would get SO frustrated when other asthmatic runners were still running 15 minute races, whereas I slaved to run 18-19 minutes. And their asthma was often worse than mine. I couldn't figure out what the confounding variable was that was making me slower. 

But the allergies, on the other hand...that's a factor I've never considered before. I've also heard rumor that antihistamines can slow you down. But I'm not entirely sure. However, guess who's been taking antihistamines daily ever since he was a tiny little tot who couldn't breathe around the little baby chicks his kindergarten class hatched...

More research on this to come, probably. Until then, deep breathing.