Whenever l go into a pool l get a really bad headache. Could this be a chlorine allergy? How do l get rid of this/prevent this from happening?

It could be an allergy or just a sensitivity to the smell. About all you can do is find a pool that has less chlorine or go swimming where there is NO chlorine . We stick to rivers and streams because of that reason. My sister has an allergy to chlorine. It makes blisters on her skin. so you are not the only one.