Has anyone heard of nipple adversion? my DS is ...

Has anyone heard of nipple adversion? my DS is four months old and mainly in the evenings refuses to feed, he looks at my breast as if its evil and scared of it then screams cause hes hungry. This has been going on for about three weeks now and is stressful when hes crying because hes hungry yet wont feed eventually he falls asleep then wakes and feeds when hes half asleep. I thought it was because of reflux -maybe it is??- but mother inlaw said this usally happens in six month olds. Is this a fase. Has any one else had this problem?