Your symptoms suggest irritation or infection of the ear canal, likely worsened by repeated use of cotton buds, which can injure the skin and push infection deeper. Since you now have severe pain and yellow discharge and are not improving with Candibiotic drops, you should stop using cotton buds and avoid putting anything into the ear, keep the ear dry, and seek an ENT doctor's evaluation as soon as possible, as you may need proper cleaning of the ear and specific treatment such as antibiotic or antifungal medication based on the cause. You can take pain relief as advised, but do not self-medicate further, and seek urgent care if pain becomes severe, swelling develops, or hearing is affected.