How take care of hair after exercise ?

i exercise 5 day a week. recently i noticed that my scalp is itching a lot and amy hair is also falling off. i used shampoo my hair everyday but due to lack of time i only wash it 3 time a week. Please give good easy remedies.as i a have a very busy routine i cannot spend much time taking care of my hair or go to a saloon. and please Help. also remind u I have very oily hair,which cause me buildup.