DANDRUFFFFFFFFF!!!!!!!!!!!!!!!…

Help please read this carefully this may be long but i really need help I need help on dandruff it gets really annoying. I've been using Head and Shoulders dandruff care and my doctor says that you should put head and shoulders on for 15 minutes and rinse (he also said minimum 10 min) it's been working for the last few weeks but then starting early last week, summer school finals tests were coming up so i've been taking shorter showers and had the shampoo on for at least 5 minutes 'cus i had to study for the tests and now dandruff is coming back and it's worse than b4 Im really really worried, i"ve heard about dandruff combs and stuff but i don't really think it will work and I'm not into like lemon juice baths or vinegar baths and stuff Help. Please. Schools startin' and all my friends at mid schewl will laugh 'cus of my dandruf. Help. Please.