a blood clot in your lungs would cause more than the "feeling like you are not getting enough air" if you had a PE you wouldn't be able to be sitting here typing.
air hunger or feeling like you are not getting enough air is exceedingly common with anxiety. I have had it. it is quite aggravating, to be sure. I think I find breathing symptoms and eye symptoms to be the hardest not to think about or monitor. that is because we breathe 24/7 and we 'see' all of the time. the feeling you are having is due to you monitoring (whether you realize it or not) your body and just an amped up nervous system. You are stuck in fight/flight mode. the same goes for your lip issue.
the more you think about, pay attention to, or feel scared about this, the worse you will feel.
Ultimately You have to accept what anxiety/stress does to a body. You know anxiety/stress don't have an on/off switch. Just because you may feel calm for an hour or a day or a week, it does NOT mean your mind and body are relaxed. It can take months of reduced anxiety before a body reverts to a more non-reactive state. Unfortunately paying attention to what is going on in your body IS what keeps your mind amped up.
so what to do? You have to start some proactive habits: the best one, for me (other than mentally and emotionally accepting that anxiety/stress cause just about anything you can think of) was to REALLY and I mean REALLY
distract the mind. That means you need to involve yourself in meaningful activities. Ones that truly take you away to the point that you are not checking to see if you are still feeling X,Y or Z. It is not UNTIL you can do this will your mind and body calm down. What happens with these non-monitored activities is you mind/body calms. At some point... it could be hours or days or weeks----you will all of a sudden notice that your breathing feels right. Now it may only be momentarily BUT this is what I call learning moments. these are the moments that you should learn from. As time goes on, the snippets of 'normal' get longer.
back in '97 i was in a horrific MS fear. I'd been to docs/shrinks and all of that. I still had symptoms and still a mess. at some point I decided I could wait until MS took away my mobility OR I could say 'screw it' and live my life. II chose to live my life. I began a large gardening project. I threw myself into it. it was so engrossing that at the end of the project--about 3 wks--I noticed most of my symptoms were gone and others were greatly diminished.
somethings that are keeping you a wreck
are: monitoring, self-checking/testing (ie feeling your lip), seeking reassurance that you really are okay.