I thought sharing my recent experience with my mother might be helpful.
For a few years, I was increasingly worried about Mum's memory. She was forgetting more and more things, even really important things. Eventually, it got to the stage where she would continuously repeat herself because she'd forgotten what she'd said 5 minutes before.
She was finally diagnosed with Vitamin B12 deficiency. Several injections later and her memory is back. She now has the condition monitored so they can 'top her up' before she gets low enough to have problems.
I've come across a few people recently who have also been diagnosed with this after experiencing memory problems. So I thought it was worth reminding people - if you're struggling with memory issues, it might be more than meno so ask your GP about vitamin deficiency!