Memory loss

Hi, I am 53 years old and had a minor stroke 6 years ago. I have recovered almost fully. The only problem i have is that i sometimes forget things and sometimes it can be like a full day is blocked from my mind that i can't remember . I now live with my son. He built a flat for me and has offered to give me work in the Insurance industry. The problem that now arises is that he can't see that I had been handling a whole regions budget previously and now it takes me more time to understand and specially to remember things he explains to me. He also can't understand that the last 6 years i have been writing everything down because i forget stuff quickly. I would do something like yesterday and then today i would be totally blank about how i did it and have to go back to my notes. This happens regularly. Is there something i can do to change this memory problem i have? My son don't seem to understand. He says stuff like he is sick of hearing that i use my minor stroke as an excuse. I seem to go back into my depressive state as soon as he treats me like this. I need help please. Is there a medication i can take to help me with this? To make my memory better?