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Has she been outdoors alone? In a fenced area or roaming?
Exposed to any poisons that you know of?
What is the name of the medication?
I hate to say it, but there are a lot of conditions that can cause the symptoms that you are seeing. The first one that comes to mind is that this is a neurologic disorder. The second thing to rule out would be a that she ingested a toxin or other irritant.
Blood sugar fluctuations can also cause tremors and shaking. If you suspect this, you can give a small amount of karo syrup on the tongue and see if she perks up.
I hate that I can't give you a more definitive answer but you need to see the vet to rule out liver problems and high blood pressure.
I think that you should see the vet first thing in the morning.
Let me know if you have more questions.
She may be having a pseudo pregnancy and be experiencing false labor. It's rare but it does happen. Keep in mind that even though she has not been exposed to male dogs and kept in a fence, there is a chance that someone snuck up on her. I have seen dogs mate through chain link before. It's not a pretty site but it happens.
Either way, you need to see the vet tomorrow to rule out a major problem, especially since she is producing milk.
Did they give you a reason for the milk production?
I am happy to hear that she is doing ok.
I am glad that you got treatment and that we were able to help.