Been using head&shoulder for 2weeks for red itchy patches allover my head they are still everywhere so I use something else or be checked out for it?

Check it out. Diagnosis first. Everything is not fungal. If it is fungal head and shoulder is not as effective as Nizoral (ketoconazole) shampoo. Try that twice a week for 2 weeks and if see no change see PCP or dermatologist .