Hi,
Welcome to ehealthforum.
The bleeding/periods that you experienced while being on the hormonal pills would have been the withdrawal bleeding. The causes for the irregularity of periods could be many (hormonal derangements, PCOS, ovarian cysts, endometrial problems, ovarian suppression, etc). You should consider visiting your gynecologist/obstetrician at the earliest for further evaluation to look for the underlying cause for the irregular periods. Treatment as appropriate (based on the examination findings and investigation results) would be started to help you in regulating your periods. If you have had experience of side effects, you can also consider requesting for alternate low dosage pills to help you. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Take adequate rest. Drink plenty of water. Maintain healthy diet and lifestyle.
Take care.