Bless, I wasn’t trying to out you, honest!
Cog probs are very common indeed with MS, and they’re worth fighting against. Have you looked at Jo Johnson’s helpful materials on dealing with MS? You can google her easily (she’s the neuropsychologist, not the MP :>)
My comments addressed to “you” (the person) above still stand. IMO it takes a lot of effort and dedication, but it is possible to get your brain back on track by having coping strategies to deal with urgent problems and trying to relearn lost skills.
By coping strategies, I mean things like ALWAYS putting a timer on first before you start cooking, then ALWAYS checking the cooker and resetting the timer whenever it goes off, and ALWAYS checking whether the cooker’s on (and switching it off) when the phone rings. Building habits to cope with things you might overlook daily could quite literally be a lifesaver.