Trouble latching?!

So baby boy is 2 days old and was circumcised this morning. Ever since, we've had an extremely hard time getting him to latch and eat for more than 15-20 min. Has anyone else had this issue? How long did it last? Do you have any suggestions on anything we can try?? He uses me as a paci for a few minutes and then sleeps for hours. Before he was snipped, he was eating for a good 45 min each time every 3-4 hrs. Thanks in advance!!