Please please pls help me find the cause of my hypersalivation

So I’m going on here because I have no other options, I have had hypersalivation for the last three months and its driven me crazy. Here’s some context, I am a 20-year-old male who exercises almost daily, I don’t drink soda or much processed food. I’m generally a pretty healthy, happy, and chill guy, but this hypersalivation has truly ruined my life completely. It has caused severe stress and anxiety, and it just downright makes me dread waking up in the morning. So it all started when I woke up one day and went to take grandma to the airport and I felt like I couldn’t really talk and my mouth felt weird (I just attributed it to having had woken up early) so I threw in some gum and went about my day, then later that night as I’m chilling on the coach watching a movie I realized my mouth was just filling up incredibly rapidly and I was just confused and then I realized I was hypersalivating for no apparent reason and its been that way since then not stop 24/7 365. I just want to find the cause of my hypersalivation so I can fix it and go about my life again.

My symptoms feel like my mouth just fill right up with water (spit but very serous spit) and If I swallow it’ll just fill right back up again, and when I spit it out it’ll just be very watery spit but I can basically keep spitting into infinity because the production never stops

I have been to 3 ENT doctors who all said everything looked good and I’m in the process of getting a CT scan done on my salivary glands.

I have been to 2 GI doctors who said everything looked good and I got an endoscopy done and all good

I have been to 3 General Doctors who said everything was all good and got blood and urine tests done which also came back perfect

My ideas of Potential causes of hypersalivation are:

-Prior to getting this hypersalivation I water fasted for three full days in which I was chewing gum all day. Somewhere throughout that whole process maybe my parasympathetic system, which controls salivary production got jacked up by something I did and it hasn’t been able to return to its normal state

-The same day the hypersalivation started I also got a tattoo in the upper middle chest that extends to the traps, maybe it caused some nerve damage or affected my nervous system, but I am fairly certain that the hypersalivation started when I woke up and the tattoo was around 2pm

-I do have a very minor overbite and some crowding in my front bottom teeth but overall pretty good teeth and oral hygiene, I did have a dental procedure done about three weeks before the hypersalivation started where apparently I just had a dent in one of my molar and they just did a simple filling on it, but I had no issues the three weeks prior

-I sleep on my stomach/side, not sure if that means anything

-I developed scalloped tongue from the hypersalivation because I have a tendency to move the tongue in a place where it shouldn’t go to try to minimize the rapid accumulation or saliva, also not sure if that means anything either

With all this being said I have no idea what’s wrong with me and the doctors don’t know what’s wrong with me. No, it’s not all in my head. If you saw the shear amounts of saliva, I’m spitting out you’d be surprised. And no, it’s not an anxiety symptom, as yes, this has caused me a great deal of anxiety, but there’s a good chance I went my whole entire life without feeling anxiety before this started, as I’m just not really a anxious guy whatsoever. I would love to know your thoughts and opinions on this, and I’d do literally anything to fix this so please help me out guys.