re: OT Doctors.. I have a knot in my neck under my chin..any ideas?

Not a doctor.

Does it feel like your tongue has a cut on it but
you can't see a cut, and when you eat does it swell
bigger?
I had Salivary Gland Stones about two months. Go look in a mirror at the inside of your mouth under your tongue and push up on lump and see
if see a white stone looking deposit trying to come out of your Salivary Gland opening.
If so keep pushing it will feel like a shard of glass but it should push through keep pushing after it comes through to get all the excess saliva from blockage out, if that was it swelling will go down.
Eat more green leafy vegs. to help maintain
from getting stones.

Hope this helps.