I also had severe tear after birth and aside from d sit bath, I used ncp soaked in cotton wool to clean the affected area. Pls adhere strictly to Miriam's comment.

Oh my,you still feel this severe pain after 6 weeks? Pls do well to check that your stitch is not loosened. Well immediately after birth,its advisable to sit in warm water with dettol and salt and also to avoid sitting on the bed when breastfeeding but to always sit on a stool and close both legs tight,atleast that was what our mothers taught us. If you feel any need to see a doctor please do.

Sorry for the pain. U can also use cotton wool and moko methylated spirit to clean the place. It worked for me. U can as well give it a try. Always try and sit on it. Preferably plastic chair. Hope you were given some drugs like paracetamol, vit c and antibiotic (amoxiciline) in the hospital?