Dandruff Issue. The same or any allergy?

I have Wet Dandruff problem (Sebohrric Dandruff) due to which sticky flakes comes on my scalp as well as blood. And now I am having pimples on my forehead. I had took medication for this few months ago but it didn't worked. I was given A scalp lotion - Ketakonazole 2%, A Shampoo - Betadine-D and a tablet. ( I didn't took the tablets). The problem is becoming severe day by day. What should I do now. Help me with a correct solution. And how much time do it will take to cure completely? P.S. - I saw a tv show in which they were saying certain hair problem. And mine was same so I am assuming that I have a wet dandruff problem but actually still confused that is it the same or any allergy?? So, Please, give me solution for this.