I had Trink in for her semi-annual check-up yesterday, and she had a large wax plug in one ear. The kind where they had to put in the foamy stuff to soften it up before they could manage to flush the ear out. No infection, thankfully. And I have been given some of the foamy stuff to use at home, so hopefully we won't have this problem in the future.
The vet said to give her benadryl yesterday to help deal with any inflammation from the wax, the foam, and having her ears prodded and poked. Should I be concerned that she is still occasionally doing the head-shake thing? Give her some more benadryl? Call in the morning if she is still doing it?