Regarding Wisdom tooth. Last molar too?

+)Are they to sensitive cold(like ice cream) +)Can the pain be radiated to the second last molar too? {Yes the last molar hurts too but its on and off,with gum and jaw pain}. +)As for the second last molar - i was told i had a cavity there.Doctor pointed it out in one place but drilled in another. Its been 1 week since then: +)But what confuses me is that the teeth(2nd last molar) has 2 kinds of pain - 1st is a dull throbbing(tooth feels hotter) near the filling(between the last tooth and the filling) from time to time. 2nd is a sharp and sensitive(to ice cream)on and off pain on tip of the 2nd last molar , where it connects with last. So : i)Is it because of the wisdom tooth ii)Is it natural iii)The dentist filled the wrong place , cavity still there iv) Faulty filling v)etc,etc. It could be a combination,assumption , anything - i would just like to gain some insight about what i should do next... *Also: what is the cost of a cbct scan and is it needed to pull the wisdom tooth out..