This sounds 'normal' - under your circumstances. Your dog has to adjust to the pheno, is all. As far as dizziness, I don't think he should be having that. You can tell when your dog is dizzy by looking at his eyes: the balls of the eyes will 'twitch' side-to-side if he is dizzy. The same thing happens to drunk people - which is why the get caught dead to rights being drunk. If you are seeing this in your dog, call your vet. I'm sure all will be well. :)
Thanks, I called the vet and he assured me that he put my boy on a very low dose so he believes he simply has to adjust to the medication. I was just a little nervous seeing him shaky so when his legs gave out I was even more alarmed. If this continues or worsens the doctor said we may have to lower his medication dosage and see if the seizures begin happening again. So as of now we simply wait and monitor. Thanks for your help!