No working memory. What tests do i do?

Hi, hope you're having a good day. I have had no working memory since childhood. I used to torture myself and cry on why I was unable to remember anything, especially math. I would tell myself today I will go above and beyond my limit in class and within 10 seconds of listening to the math lecturer, I'd start thinking about something else completely different and would jerk my head to focus again. I forget if i locked the door 3-4 times and have to go back to check.  I make notes on everything to live. In college i used to forget everything after sleep. I have now recently lost two very basic jobs of customer service. The first reason that I was unable to remember what they told me and they were shocked at how I could forget something they told me so many times. I think they were fair. The second reason for termination was given by my manager saying I am inattentive and forgetful. please help god! my mother has severe schizophrenia and is on heavy medication. what tests do i do? plsss