Melt Down?

I was recently diagnosed and told I was Autistic, today before I went to work, my usual routine was disrupted , so I was feeling upset. I got to work but could not really concentrate on anything and at times I felt like crying. I managed to calm myself and think I might get through the day with some effort. However, I got a copy of my report from my assessment and when I started reading it I started crying and felt terrible and had to leaver work.

I know things weren't right with me before I got the letter, so I am wondering if what happened to me today had anything to with my condition, or was it something completely different.