What Causes Dizziness, Nausea And Headache After Starting Contraceptive Pill?

Ive been on qlaria for a month I m usually sensitive to any contraception so was weary at first I have bled since day 1 om.it lightly now it s more like a period but I feel dizzy lightheaded nauseated and have a slight headache, should I keep taking the pill I was advised to try it for a couple of months to hopefully regulate my periods which are usually heavy and irregular and to raise fertility after the couple of months Thank you for your help Becky