i get similar thing ,bubbles at bottom of teeth the gums ,and they are swollen ,butr i dont get the swollen glands etc though ,just little bubbles on my gums near the root of the teeth
my dentist i went to previously kept on telling me nothing wrong

yet he gave me anti biotics
well ,i have gone to a different dentist ,now ,as we had a row last time i saw him my gums were swollen and i was in pain all weekend and he said" i wished i saw your gums when they were swollen
they were still swollen when i saw him then ,i think he knows the problem and possibly somethign he has done ,why else would he deny anything was wrong
well new dentist has gave me anti biotics and told me to see a hyginist
and said i have so many crowns in my mouth they are high maintanance
and not my fault they need deep cleaning
my previous dentoist also sent me to hospital as he says i need deep cutting of my gums,went thursday ,he said no such thing needed doing at all and i just had a fungi infection and gave me tablets to take and i got to take my plate out at night
so how come my dentist was so wrong in his diognosis?