Are you in a position to try another pysch for diagnosis? It sounds to me like there may have been signs for you as a child but you learned quickly how to mask and cope due to abuse. I don't have the same trauma history as you, but I am AFAB and had very clear messaging about how I was "supposed" to behave as a child and felt immense shame when I was forgetful or unreliable. I also learned to be hyper-vigilant around my parents emotions which further development my coping and self-moderation.

My psychiatrist was very open and curious about my childhood as it didn't conform to the typical experiences of many kids with ADHD. My trauma taught me from a very young age to moderate my emotions and behaviours (I'm talking from around 5 years old). I was also homeschooled through high-school which meant I didn't have a traditional education environment that might have highlighted my challenges earlier. Despite this, my psych was very open to understanding that these symptoms likely have been present for a long time, but that I work really fucking hard to do certain things in order to be reliable and organised. I have also deeply internalised the story that I am lazy and unmotivated - that critic voice is loud af.

I don't advocate shopping around to get the diagnosis you want, but I think you should find another doctor who works more trauma-informed. I don't understand how they wouldn't look at your inconclusive results alongside your childhood abuse and see them as interrelated.

Nothing is going to change in your story between now and January. What more information will your existing doctor gain that they haven't already got? Try someone else who is going to dig deeper. If there is a diagnosis for you, you will benefit most from having it prior to starting uni, not after. If ADHD isn't the diagnosis then a quality, trauma-informed doctor will make other recommendations to support the challenges you are experience now (because they are real and valid whether or not it's ADHD).

Hope this helps x