When does it stop??

Ekaterina • Have two beautiful children. Anastasia 7-25-16 & Collin 9-26-12 and having another boy that is due on May!!:)also have incredible boyfriend 5-27-15
When does the let down pain stop hurting??? My daughter will be 4 weeks on Monday and oh my gosh it hurts so bad I curse and grit my teeth and bite my lip until it bleeds.