My bearded dragon is 3 years old and I've had him for 2 years. This past week he's been more active like running around his cage and wall surfing (something he hasn't done since I first got him). When he does this I take him out of his cage to run around but he's been getting angry really easily for no reason. The past couple days when he gets mad, he'll charge at me and try to lick me and head bobs at me. Nothing has changed in his set up or the way I handle him. He also has had cancer for a couple months now and I'm worried this is a sign he's in pain.