I was diagnosed with a brain tumor as well as fluid on the brain, losing memory?

Hello, a few years ago I was diagnosed with a brain tumor as well as fluid on the brain. At the time I had a shunt put in to remove the fluid but from what I recall the tumor was too deep to be able to do anything with it. I am 34, a month away from 35. This was about 4 years ago. Recently I have been losing a lot of my memory, it generally happens when I wake up. It was happening a lot but normally my memory would come back within a few minutes to a few hours, but today it’s been a few hours since I woke up and I can barely remember the last week. It took me a few hours to remember who I am and where I am. From the little I do remember and what my flatmate has said, it seems to be getting worse lately and I’m not sure what to do. Any ideas?