The Potions Master's Bane

Harry is suffering from a magical muscle disease, however, does his best to get along in his first Hogwarts year. If only the Potions Master did not hate him so much! When Harry's attempt to change the Potions Master's opinion fails, he travels to the time of the founders to live in peace and study his favourite subject. COMPLETELY AU, partly OOC, death!Voldemort, sick!Harry