Hi!
I dediced to post after reading almost the whole thread. English is not my first language so I hope I can find the correct words for everything.

My problems started in April this year, now 5 months ago. I was sitting in the sofa and suddenly could not take deep breaths. It felt like my ribcage was to tight or just not flexible enough for my lungs. I have felt this a maybe two times before, both times when I was our running, but it disappeared the same day.
Combined with the not being able to take deep breath issuse (or if its the same thing, im not sure from times to times) I can't finish a yawn. I have a hard time to get the last satisfying feeling when i yawn.
This kept on going for days and weeks with almost the same intensity every day, except for in the mornings, then I had no issues at all. After about 2 weeks I woke up one morning and the yawning/breathing issue was almost gone, instead I had a burning sensation in the middle of the chest, a mix of a pressure and burning. Almost like a bronchitis feeling. This feeling was gone the next day and back was the yawning/SOB issue.
And so it went on for weeks. I started getting palpations, maybe from anxiety of not knowing what my problems originated from.

I went to see my naprapath who couldnt really find anything unusual, maybe a bit of stiffness in my back. She said it might be costochondritis after hearing me telling about the chest pressure. I got a few excercises to do at home, but nothing really helped.
I booked a doctors appointment and she took all the blood tests possible and all results came back fine. My lungs souded fine and oxygenlevels were excellent. She ordinated a ECG (both short time and a longer one where I carried a monitor for 2 days). Everything looked great.
She prescibed me an inhalator, which I tried for two weeks without any improvement (maybe, maybe a little improvement but it might have been placebo). When nothing else was found at this point my doctor thougt it might be anxiety and stress and I agreed on trying medication for this. But it did not help.

I stopped seing the doctor after she went on a vacation, it felt more like she thought I was a hypocondric.
I found this lady doing a therapy called "Lotorpsmetoden", a mixed of massage where she massage (not sure of the english word) "trigger points" aorund the muscles of my ribcage and measured how much my ribcage was able to expand before the treatment and after. There was a pretty big difference of 5 cm. After two treatment sessions i started feeling better. I had some days that were worse but also some days that I did not have any symptoms att all.

I have had 2 months with almost no yawning or breathing issues but it started again 2 weeks ago, not as bad as before but still, its back. One day i started feeling sick, I had headaches, shivered, cough and the same chest pressure I had in the beginning. The next day, this was gone. Now I have had 2 days where the yawning issue had been quite annoying and I went to see my naprapath again today. She recommended me to get an X-ray of my neck and back to see if I might have disc herniation in my neck. She had other patients with similar symptoms like my yawning and chest tighness that actually was problems caused by disc herniations in the neck. So lets see, im going to try the new excercises she gave me and see if it gets any better.

And about me. Im a 36 year old woman with no other medical conditions (not now or in the past, that I know of). I have never smoked, I dont have asthma, I dont use medication or drugs. Im not obese or overweight. Im in pretty good shape and I run (despite sob and yawning issues) 4 times a week. I dont have a very stressful life at all. I never have had problems with real anxiety or something like that.

Im not so anxious anymore about this could be anything severe. And somehow I think this all could have started as a reaction from a riding accident I had in March where I fell of and hurt my ribs. I didnt break anything but it hurted like h*ell for a week. So maybe, I somehow started breathing differently or wrong after that, combined with anxiety of covid-19 and working from home and sitting in bad positions. The only thing that really sound like this and fits almost all of my symptoms is Dysfunctional Breathing. So if thats it...I just need to find a way to breathe right again.