I doubt that Nizoral is behind your hair falling out, but I don't think it is good to be using every day. Ketoanalconahole (active ingredient in Nizoral) is a substance that is best used in moderation. It won't hurt your hair, but if systematically absorbed, it can be a bit hard on the liver (if my memory serves me right.)
Choice of shampoo is a highly personal one as a shampoo that works well with one person's hair might fry another person's hair from dryness, and weigh down with over-moisturization a third person's hair. Each person's hair has a certain affinity for different shampoo formulations and it requires a lot of experimentation on your part to find a shampoo that "works well" with your hair in particular.
Some good starting points that I would recommend would be Infusium 23 "Original" blend, or Paul Mitchell "Shampoo One".