Regression impacting relationship

I am newly diagnosed though the outcome was expected after feeling my traits growing more prevalent over the last few years due to life struggles. The stress has impacted me and creates a cycle: making me feel worse, my autistic traits grow stronger and impacts my family and I feel even worse still.

At this stage I just feel like I am having a negative impact on my relationship. I hoped my diagnosis would make me feel like there was a rationale for my problems but I am now just seeing myself as some different and less capable. 

I hear the terms like regression and burnout and it feels like its what's happening. But as I try to address it I am worried about who I have become. I am someone so different now, I wasn't the person of 10 years ago and I feel like I am less good, less able and more of a problem. I want to be me again, autistic but not like this