I Have Been Experiencing Muscle & Joint Problems In My

I have been experiencing muscle & joint problems in my legs & also in my biceps & shoulders .can hardly get up in the morning so stiff. Have always been pain free and a runner. my chiropractor checked me over & could not find anything. Then happen to ask me if I was on colestrol medicine . I said yes simvastin. He told me stop taking it .how long does it take to feel better? It's been a week feel some better. Will I get over this completely or some side effects for life?