V.S.
I get like that, too! I try to keep sunblock on at all times. I like Aveeno brand but they also have spray on types that aren't very greasy feeling. There are alot of great sunscreens out there that are safe to use. There is a website (http://www.ewg.org/skindeep/#) that you can look up whats in the cosmetics you use and how safe it is.
For when you forget try a cool shower, it feels so nice! And if all else fails-aloe.
PS-I'm also still nursing and don't like to put alot of chemicals on my skin.