I just started cabergoline for elevated prolactin, but im on bc pills, so how will this effect my hormones? I suffer from anxiety, night sweats, acne.

It won't. Cabergoline will decrease prolactin levels but will not affect you estrogen and Progesterone because of the birth control you take. If you are having sx of night sweats, anxiety or acne there may be some other problem. Often birthcontrol will help adult acne in women depending on the formulation.