12 weeks baby crying always when breastfeeding!!!

I had my baby girl on August 13 she's been having trouble with latching since birth. She will only breastfeed when she feels like it. I tried breast pumping since birth but stopped because the milk won't come down. Now she's 12 weeks should I seek a lactation consultant for an opinion. It is very disappointing and heartbreaking that she's not breastfeeding because she's very colicky and now she's on Nutramigen. Any ideas or opinions?!?!?!?