Neurodivergence

I (M, 46, ASD1) have been feeling very overstimulated today. Everything has me on edge and everything is too much (this isn't the first time I have felt this). I want to say I have a headache and call it a day, but that isn't it this is that different thing. I mean if I am honest it's going to cause me to have a headache but that isn't how it started. This is that supernova inside that feels like the edge of something. That feeling of "if you know what's good for you" but you just can't say it out loud.

I am late diagnosis and I really never got support or words for this. I was hoping someone here could help me. Is there something I can do? Is there a name for this? Is it appropriate to warn people about this? I am really irritable, is it healthy for me to be masking this as hard as I am and just screaming about it later when I can? I know how I have dealt with all of this all of these years and frankly it has lead to a lot of other mental health problems. So really any words of wisdom would be welcome.