Confused is it weakness / something else

I have started being confused for a month ago and having urge to sleep ( I wake up at 6.00am, but I never had urge to sleep) , I had vertigo a week ago then I used Ear Drops Now Iam perfectly fine, when ever I am busy with my work I get confused with what someone is saying to me or feel like loss of words,I started taking health Ok powder and I'm one day I am feeling better I didn't got trouble in conversation but feeling sleepy and confused when I walk up at evening I thought it was morning, I always remember things like where are keys, etc, I consulted with my friend who is a MD physict he told me to take memantine hydrochloride 5 and mecobalamin extended release and vitamins for one month and then discontinue plz suggest should I take it for one month as it is alhzermias medicine, am I having something serious