I think you may find this article of interest:
I've had my own experience that seems really similar to what you are describing, this was after drinking a second cup of ayahuasca, during my third and final ceremony one Christmas day (and birthday), full moon night in Peru a few years back.
This third and final ceremony on the Christmas day night was the most powerful. After my second cup, and right after my second purge, I started getting LOTS of fluid pouring out of my upper nasal sinus passages...important to emphasise this was NOT just a runny nose, or my salivary glands. For some time, I had to swallow every few seconds, the shaman heard it too. I've never experienced anything like this before. It rang a bell with regard to the yogi's, who talk about amrita, dripping down from a similar place, and this got me curious (this fluid lacked much of a flavour from what I can recall, although it largely bypassed my tongue, running down the back of my throat).
This was a very intense ayahuasca experience for me, I was kinda on the brink of panic for a bit, toe curling intensity, I had been sitting up straight but felt like I needed to have a lie down at that stage. I think my most intense ever encounter with aya...at the time there was a myriad of different shades of light patterns, woven onto canvases of darkness, ever moving, and my central point/third eye was the brightest of all. Very chaotic though, I couldn't glean much insight from it, it was like a cosmic consciousness rollercoaster.
But anyway, I was AMAZED at the volume of fluid I was producing!! I had to swallow every few seconds to keep up. A stated, this was during my third ceremony in a week, right after purging my second serving of the night...this seemed to trigger it. The yogic model really is the only thing that seems to have much of a clue when it comes to what was [maybe] going on there. But it got me more curious about yogic techniques in general.
A Nexus thread that may be of interest.