Memory problems anybody? Cocktail side effect?

My brother has memory problems. He forgets if he ate or not. They gave him one extra week of radiation because the tumor kept growing during the radiation. Also he is on the cocktail now and I am wondering if any of the cocktail ingredients could be causing it. I red something about omeprazole and Alzheimer link. Also people get high by taking omeprazole with some other agents. I am wondering if combining omeprazole with other agents could be causing it. Any suggestions. I am wondering what to take out from the cocktail. The good news is that the last Pet scan with choline looks better than the ct scan from June. The doctor who does not know about the drugs is very surprised. I am worried about the memory though I don't want to make it worse. Is it someting to be expected after radiation or maybe the extra things he is taking like ashwaganda or hepatometer combined with omeprazole? Please give your opinion :)