Hi, One sided headaches usually are indicative of migraine. They are usually associated with prolonged stress or mild to moderate depression. It is imperative to rule out Trigeminal neuralgias in case of severe pains. I understand that you are facing these headaches since 5 years with a frequency of about 3-4 episodes per year. Depending on the intensity and duration of the episodes, Homoeopathic medicines can effectively treat the headahces (migraine / trigeminal neuralgia - subject to confirmation) in about 1-2 years. Homeoapthy medicines target the root cause of the disease thereby giving long term benefits without any side effects. For any further queries, you may contact me via Practo online portal.