I GO TO COSMETOLOGY SCHOOL -- DO NOT USE INEXPENSIVE SHAMPOOS FROM THE GROCERY STORE. Some people can get away with it. Mainly those of us who have medium strait hair.
Pert, Suave, Pantene, Dove, Garnier, etc are all BAD. The surfactants (cleansing agents) are too strong!!!
If you can't bathe in it, don't put it on your head! I get rashes from many of those brands, and all of them make my scalp dry and itchy because they DRY out your hair follicles.
OP, how thick is your hair (Is there a lot of it on your head)? Do you have fine, medium, thick hair? IS it wavy, curly?
If you can, at least invest in a good shampoo -- I recommend the 'It's a 10' brand or various 'Redken' products.
I use this product: It has IMPROVED the health of my hair. My split ends feel much better!
Also, I recommend these products:
My school is endorsed by Redken so I use their products ALL THE TIME so I know which ones are good!
Also, if your scalp is itchy, that is normally due to a Ph imbalance that your current shampoo could be making worse. Many Redken products AND other salon grade ARE Ph balanced (4.5-4.7). So, Head and Shoulders, T-Gell, and various other Dandruff shampoos can make it worse (they did for me until I switched to higher quality shampoo).