You could be getting pericornitis or an abscess in that area. I would recommend seeing an oral surgeon or dentist to get it evaluated.
I would recommend seeking a second opinion from an endondontist. With fractures, sometimes it not known how deep they go or whether or not the tooth is "restorable." Restorable meaning that a crown will fix the problem and not have any future complications.
Has anyone told you that you clench or grind your teeth at night? You may be doing that and it may be putting some stress on your TMJ. I would recommend going to a dentist to get it evaluated. You may need to see a dentist who has advanced training in TMJ problems.
I would attempt to adjust the bite first as its less traumatic before getting an endodontic consult.
I've never heard of the term dry drowning. I assume its a lack of oxygen such as drowning but without any liquids. I have never heard of any patients suffering from dry drowning from a dental suction. If there was that much discomfort and problems with the suction, I would imagine all you need to do is open your mouth and get more oxygen.