Random hot flashes!!

I'm 19 and for the last 2 months or so I've been having hot flashes!! It's terrible, clearly I'm too young for the normal reasons for hot flashes but can anyone help me out to determine this? They normally happen at the sides of my neck and tops of my shoulders and also at my thigh area. I do take anxiety medicine but I've been on my new dosage of Prozac since sometime in the Spring so it would be weird that these symptoms are starting now and not right when I switched