I have terrible memory issues that seem to be hereditary. The things that help the most are having a daily routine and minimizing things that might sidetrack me mid-task. If someone asks me a question while I'm carrying something, it's pretty likely the thing will be lost.

Stimulants would be more useful for maintaining focus on a task like filling out forms or mathematics work. I don't think they necessarily help with general memory issues, but all these things together make it much easier to maintain focus.

The single biggest contributor to focus, memory, and mental health issues for me personally is sleep quality. If you snore, or you wake up with back or leg pain, etc., that carries over and adds up over time. There's no magic bullet, just a lot of incremental improvements that don't seem to do anything on their own.

Stimulants shouldn't affect memory directly but, at the same time, they kinda do. Take myself as an example, I have good long term memory but just like you I also forget things I just thought (or was told). That means the problem here is not retrieving information stored in my brain, but actually saving it in my head. What stimulants might do is improve focus, so you actually save the info in your brain before forgetting it. This doesn't necessarily work for everyone, but it's a common treatment for ADHD for a reason.