I am afraid that iritis does not go away on its own. On the contrary, it gets worse if you do not go to see a doctor as soon as possible. If left untreated, iritis becomes very painful and can lead to vision loss, cataract, glaucoma, corneal calcification, posterior uveitis, cystoid macular oedema and band keratopathy. Treatments of iritis usually involve corticosteroid eye drops, dilating eye drops, oral steroids, subconjunctival steroid injection and steroid sparing agents. In a word, you should ask your ophthalmologist to help prescribe and begin treatment.