I've been on the pill, and now getting problems?

When i started the pill, i refused to eat for 3 days. I then felt really different and really snappy. I carried on taking it and gave it 3 months try, it then went away but i then suffered from headaches and more spots. I haven't got time to get to the doctors, so i us ally put a repet pprescribionion in. Do i need to change pills? or isit ok to stay on the one iam on now.