please help:( long

its been 4 days since LOs shots. He started to run a slight fever after getting them but through the night it went down and the next morning he was back to himself. However,the past 3 days have been absolutely HORRiBLE!! & its only during the day time. He will wake up and eat,burp,and then SCREAM. We make sure to at least get 2 good burps out of him after every feeding,we change him,we cover him up so he's not cold, he is pooping just fine and passing gas-we tried giving him tylenol thinking he may be in pain-nothing, we tried giving him some gas relief drops-nothing. I know you are bot suppose to let them cry it out-he's so little and i hate to do it but nothing is comforting him-not even walking around the house bouncing,talking to him,music,toys,NOTHING!!! I feel horrible because I don't know how to help him or what it could possibly be. Today he started doing this thing where he was hungry but he wouldn't tale the nipple when offered(EBF) until I like had to-what seemed like-shove it in his mouth,it took a good 10 minutes for him to realize it was there! then he just ate like it was nothing and after went back to screaming. This all stops at night though once we get into the bed....? please someone give me some advice?