Yes, unfortunately it is painful. Although I must say that I am suprised the pain has set in so quickly for you which may be a good sign that the medication is already working. I will pray that this is the case. I normally ended up with elevated pain levels the day after.
Did they tell you to ice after the procedure? This will help with the inflammation. I recommend staying away from heat for the first 48 hours if you can.
I would recommend that you call them back tomorrow if you are still nauseous tomorrow and maybe they can call in something to help lesson the symptoms for you. If you are having a headache with the nauseous, I would call tonight personally.
Good luck and I pray that you feel better soon.