I went cold turkey with both my girls and just expressed to take away the discomfort. I was very lumpy with DD2 and in pain (I thought it was mastitis but GP said no. She also said that lumps were very common in quick weaning, and so was the shooting pain I was experiencing). The best thing I found to help was to get under a hot shower and hand express there, trying to smooth "through" the lumps if that makes sense. The hot water relieves a bit of the pain and helps the milk to flow with minimum stimulation.

Take the boys in the shower with you so you can spend some time. Good luck. I hope you get some relief soon.

ETA: Please just be very careful with anything you take, whether over the counter or herbal. The last thing you need is nasty side effects with your medication