Extreme pains + oddness while stoned.

Hey all,

This is something that has been going on for months, but I'm still not sure what to think of it. Often, after smoking or vaping a bowl, I'll start to experience some strange medical symptoms. The problem is, I'm not sure if they're actually going on or if they're just in my head - but I get so focused on them while high that they seem extremely intense. I keep reminding myself that I'm probably just too blazed but I can't stop focusing on them, which makes them worse.

Here are some examples of what I experience:
Inability to feel myself breathing - I start to feel like I'm not getting enough oxygen and start breathing deeper in an attempt to remedy this, to no avail, and then my breathing 'rhythm' gets all thrown off.

Intense pain that seems to move around my body. This was most intense while watching a movie with some friends after vaping a bowl a while back, I would feel a slight pain somewhere in my body which would get more and more intense until it felt like nothing else in the universe existed besides myself and that pain. It would generally go away if I shifted my body/the way I was sitting, and then come back somewhere else. This was easily the worst two hours of my life because I had never even imagined that pain this intense was possible.

Sudden rushes of blood to the head (at least, that's what they feel like) - I feel an intense pressure in my head and my vision gets slightly blurry for a moment.

I have had moments where I legitimately thought that I was dying while high, but I haven't said anything to anyone about it because they just sound so ridiculous that I feel like I'd be laughed at :) These all feel like extremely serious medical conditions that require immediate treatment, but I never experience this sort of stuff while I'm not high, which leads me to believe that it's just the pot doing it to me.

Anyway, has anyone else had similar experiences? If so, is there anything that I can do about them? It has been ruining my enjoyment of the drug I love so dearly and I'm honestly scared to smoke a bowl these days. I would really appreciate any advice you can give me!

Edit: I should point out, too, that I've tried to "just relax" and stop thinking about this stuff, but that's much easier said than done, and I've had no success.