Hi, I would get in touch with the dentist first of all, but it sounds like the muck from the cavitation has been stirred up from being removed and possibly making you very sick. I've heard of this before happening.

But get in touch with the dentist and have it looked at and see if he can do more for you and advise in case you need antibiotics.

IMagine how much garbage is in a cavitation and what happens when it's shifted and removed. I've heard of people getting very sick from the toxins released by it. But if he's done a good enough job? It should settle and things should get better.