My dog is acting strange?

Hello, I'm new here and I have a one year old pup, I believe he has jack Russell and beagle in him. Here recently he has been shaking his head regularly and I found out he has ear mites I bought some ear drops and started them three days ago. But a couple hours ago he started acting weird and scared, he is usually hyper and active like any jack Russell, but he wouldn't come he started shaking badly and now he won't let me go anywhere an just wants to lay in my lap. I'm not sure if its the ear mites or what but I am worried.