i had a root canal done on monday, and was having a post and crown but was told the post would not go in, so instead i am having a tooth screwed in, i was in pain on the tuesday got no sleep went back yesterday and was given metronidazole 200mg and amoxicillin 250mg and told to take of each forseven days when can i expect to get any relief my whole mouth feels likes it going explode, and i now have a very sensetive front tooth which i didnt have before