Stress is main common reason of hair fall problem, water, and food we intake..using of such hair creams gel or shampoo can cause hair fall too but only in limited case.
Genetic or family inheritance is somehow a reason also..
My advice is don't use the shower instead a plastic pail to pour in to use when taking shower mix the shampoo with little water in your hand before applying starting at the back of your head ,use only normal temperature of water.
Buy such a hair energizing like Shiseido Adenogen to massage in your scalp morning and evening it will help alot since it contains adenosine ingredient to soften the pore of each and every hair shalf it also moisturize the skin of the scalp and help the new hair growth to be strong and healthy..FGF7 is a normal cycle as we reach the age of 26 and above which means hair is so fine and unhealthy due to lifestyle, stress and environmental polution effect..
just try this and see the result if not then consult a dermatologist doctor...