Sorry for the late reply, I didn't see your post til now. I'm sorry you have pain in your cavities. Have you tried salt water rinsing? That's worked well for me in the
past.
My improvement with the calcium products was gradual and I was doing a lot of other things as well, so it's hard to pinpoint what helped the most.
You might try adding MSM to your OP and also take it internally along with vitamin C. MSM has pain relieving properties and the vitamin C would help kill the bacteria which are causing the pain. Xylitol would probably help, too, as it has antibacterial action.
I'd encourage you to research at the site healingteethnaturally.com which gives a lot of options for dental care.