Baby not feeling well

Mari

Hey everyone. I’m a first time mama. For a few days now, my 4 month old baby has been extremely fussy (which is not my baby) he’s usually always happy, always smiling and laughing. Out of no where he started being fussy, is throwing up every time he feeds forcefully, hasn’t had a lot of wet diapers like he had before, is refusing to eat, watery yellow diarrhea and just wants to sleep all the time. I went to see his doctor yesterday morning and she said everything was okay, just to keep an eye on him and she will give me a call to see how he’s doing next week. Later that night, we threw up so much, more than he ever has so I decided to take him into the ER. They said everything was fine as well. I was looking online and got him a sensitive formula to see if maybe it was the milk but he doesn’t want to eat! I know my baby and I know something isn’t right. I feel like a horrible mom. Someone please help.