Something is definitely wrong. Get in touch with a vet or take him to an emergency vet clinic.
You can also ask a vet questions online---here's one link:
My dog is acting weird like hes in trouble and won't respond normal to my affection or play and is shaking?
Shaking is most often a sign of pain distress, mental or physical.
Cautiously examine your pup for painful areas.
Contact a vet.
You had time to tell us about it and not take him to vet?
I would suggest to take him to the vets asap so you can get stuff like tat looked at or you can get some pet advice from many website, good place to pet advice can be found here - www.mypetzilla.co.uk/pet-advice