vibrating dog

[rshopelmt]

My 8 yr old fm yorkie is acting odd. Yesterday she began by walking around as if she were trying to find a place to lay. Also seemed to act like it would hurt her to lay down. I put her on the couch with me and noticed that she seemed tight all over and that she seemed to be vibrating.
I listened to her heart with stethoscope and you could hear the vibration as if she had a motor running inside her. The vibration seems located only in her upper quarters, head and neck.
Some history: She has been having seizures for about 2 years. She gets very stiff and pants and drools until it ends. Usually lasting several minutes.
I have very limited income and a trip to the vet would be a hard hit right now.
Any ideas?
She seems to be slightly better today than last night but not at all well.