I think it may be worth speaking to your MS nurse to get this problem checked out. Mine put me in touch with a clinical psychologist because I've been struggling with cognitive functions just like yours. I had a series of tests to check memory verbal reasoning and solving puzzles and recognising patterns etc . Well they found I've still got a brain but have a problem with what they call " working memory" I'm still waiting for his report which will also suggest strategies to help. I have to put all appointments in my phone and add notes for anything I need to remember on any particular day. When I was working and I noticed this problem I always asked whoever I had spoken to on the phone to put it in writing on an email so I didn't miss anything. I don't know if this is something practical you can do. I wish you all the best and hope you find some coping strategies to help you deal with this problem.

I experience this I s gotten better but having someone to help you with things small like taking time to explain things and when you to take your medicine and such helps. God bless and hope for the best I'm your journey.