Refusing to drink milk!! Help!

My baby is refusing to drink milk for 3 days now. I switched from formula to regular milk about two weeks ago. She did just fine with whole milk with cream of wheat added to it for a little extra thickness. Then all of a sudden about 3 days ago she refused to drink any milk with or without added porridge. She shakes her head no, cries and runs from the bottle if I try to give it to her. Has anyone experienced this? As of now she will take a sip or two of cold milk. That’s it.

Thanks.