Dyssynergic Defecation

Does anyone suffer with dyssynergic defication? Which means you cant relax your anus muscle in order to defecate. I know its gross. But I am 9 weeks pp, suffering with that. I am breasfeeding and only treatment my doctor offers is not breastfeeding friendly. I am depressed, coz I feel like a failure and a terrible mom, because I have so much milk and I have to stop giving it to my baby! I am addicted to breasfeeding no less than my baby is. 15 minutes of breasfeeding is the best 15 minute I can get from the world. I am not ready for quitting and on the other hand my problem becomes more and more complicated. Any thoughts? Any tips? Any experience?