@CantExplain
Whilst I found(following your opinion) I probably got it wrong considering psychotherapy inclusive of ALL the most common therapeutic approches, including pharmacotherapy, it is not an easy task to find an appropriate forum. The question I asked appears in fact to be at the limit between diagnosis and scientific research. I asked here because I thought some psychotherapists (in general, not only psychoanalysts) could be around.

@ECHOES
It doesn't seem I have sleep apnea, despite my sleep isn't that restorative and I have difficulty waking up. But I often feel breathless during the day. This of course is in major part due to stress, anxiety etc. My doubt however regards an hypothetical obstacle to well-being constituted by a reduced breath capacity during the day, and night too (considering no sleep apnea however). This obstacle in my case cannot be the primary cause of my problems as my deviated septum is of traumatic origin and my problems started well before this happened.
Since I do not have that much time and septoplasty scares me a bit, I am trying to learn and understand If my quality of life may improve or not. My feeling says that it would but I couldn't find literature on this topic by using similar search terms to the ones you suggested. My otorhinolaryngologist couldn't answer too. I will make a new search using search terms you suggested. These appear to be smarter than the ones I used.