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I would return to the vet and ask questions about using a different anti-inflammatory or muscle relaxant. I would also talk with the vet about a 1 time steroid injection that can help with pain. And you can discuss using glucosamine with the vet as a way to help.
You have some more options here.
Shaking is often a response to pain so you really should look into this further. It sounds like your vet started with the basics, which is great, but he will be happy to answer your questions and take the treatment further.
Let me know if you still have questions.