Go to TJ Maxx or Marshall and look for shampoo w/ gentle ingredients. There's tons to choose from. I've used the Garden Gate brands, Kiss My Face brands (very good) - you can find them in Woodsman.
I'm out and need to get some. I love the Kiss My Face Brand - cleans well and does not strip away your natural hair oils, makes hair shiny, and smooth - not sure about hair loss and gentle, no harsh chemicals.