I had that feeling once.
It is because your throat is really dry (Cottonmouth) and it feels like your tongue is swelling up and closing up your airway.
Really it is in your head you are fine and will continue to be.
Just drink all the time i am sure you will be fine.
Just dont think about it when toking.
catch 22 paranoia else.
Its there you think about it-more paranoia,think about it more... just let it go.