Simultaneously is redundant with "also": "I'm also noticing" and "Simultaneously, I'm noticing" both imply a reference to an external thought. You could drop 'also' instead of 'simultaneously' if you're worried about ambiguity in terms of the nature of your acknowledgement.

ps: I tapped out a message on my virtual keyboard, and didn't take my ADHD meds yet either. I guess where we differ is that I didn't use my condition to attack anyone for ableism just because they didn't agree with me.