Why won’t my stitches heal?

Dear Doctor, I gave birth a little over a month ago but the stitches still hurt terribly. I was advised by the nurses to only use water when washing myself but a cousin who has had three natural births tells me to add a little salt in the water. Would you recommend this? I’m told that stitches heal after two weeks. Why am I not healing? It hurts when I urinate and even sitting sometimes is a problem. Is there anything I can do to speed up the healing process?
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Dr. Rachna Pande