How long do you think it is reasonable to use a product for before you decide if you are reacting to it. For example I have tried two sunscreens the Aveeno one with feverfew (can't recall the name right now) and Neutrogena Visibly Firm - both recommended in the book for DSNW and had reactions within two days to them so I quit both. Am I jumping the gun - should I be waiting to see if my skin settles down. With the Aveeno one I was itchy and blotchy. The Neutrogena on felt good but I got blotchy and broke out. ???