Just need some advise

BAMF™
So my son is usually a very laid back happy boy. But lately every time I go to lay him down to change his diaper or to put lotion on after a bath he throws a full on fit. Screaming, crying, squirming, the works. I can't figure out what's going on. He used to never put up any kind of fight until a week ago. I took him to the doctor on Tuesday but made an appointment with a new doctor for next week. I'm not very fond of his current one after 2 visits. After looking at him she couldn't see or find anything out of the ordinary. No ear infections, no fever, rash, nothing. The way he's screaming it's like he's in pain. I don't know what this is. He's also started being super snuggly with me. He used to never do that. Before it was go go go with him. Have any mommies had this happen?