Had my´normal´pulmonologist test for future referencing.

The pulmonologist who is actually an open minded COPD and asthma specialist was interested in the following as well, and referred to them as neuromuscular problems:

Breathing problems starting a few years back with 9 consecutive antibiotic treatments
Breathing problems with use of sedatives, flying and during periods of muscle weakness.
He knew that it was rare to have restrictive breathing 12-16 hours after use of sedatives
but wasn´t surprised that with small rechallenge doses of sedatives there would be muscle weakness
always following restrictive breathing in that specific pattern.

I don´t think I had all the tests recommended on this thread but I had at least four (not MVV)

After a metacholine challenge test for asthma my muscles started trembling (especially the weakest ones)
then shaking quite violently and in the end even my head was nodding uncontrollably.

I have to go back for an exertion test and ultrasound of heart next week.