Feeling really shakey an nausiated what can it be an how can i stop it...?

Many possibilities: You could have the flu; could be hung over; could be withdrawing from opiates or other drugs; could have food poisoning; etc. I would add early pregnancy but your question indicates you're male. Because there are so many possible things that may cause these symptoms, you need to be seen by your doctor to come to a better reason & get helpful treatment.