Welcome to HCM.
Since you are a known TB patient, your painful red eye must be directly evaluated to rule out secondary Uveitis
due to TB. The inflammation is causing you pain and blurred vision
Once proved with slit lamp microscopy and thorough retinal examination and with few blood investigations,you might need topical eyedrops and oral medications ,depending on the degree of involvement.
Don't worry,the earlier the better. So get an ophthalmologist appointment soon. Have a fast recovery.and Donot buy OTC drugs and apply on your own as it might get aggravated.