I had afterpains for the beginiing of each bf for the first few days - for 2 or 3 days. Awful with babys 3 & 4 - pain releif didn't help plus would nearly threw up with the contractions (worse than labour) so used visualization to get thorugh it.
With DS I thought they were bad. But boy, with DD they were awful! Definately worse than labour! It felt like a long time but I think mine were worst for about 4 or 5 days then got more bearable after that. I had one day when I had a sharp pain too and was doubled over, nearly got DH to call an ambulance. Reckon it was my uterus falling down or something!