Itchy scalp? And new hairstyle?

[TheWolverine]

So i noticed i was thinning on top of my head in January when i was standing up a bright light and my hair was greasy. I panicked, looked online for shampoos and started paying more attention to my hair.

Long story short, I tried around 7 different shampoos over the course of 3 months including alpecin and a cleansing shampoo.

Have I irritated my scalp due to different shampoos? More time combing it and general touching it. My scalp and hair feel very dry. I am going to stick to head and shoulders shampoo.

Also, at the moment I have a shorting mop cut, if everything in place, under bright light I can see a little scalp towards my back, but if wind blows my hair goes all over the place and I can clearly see my scalp.

Would cutting the top short and the sides and back shorter help?