The zoning out part sounds like disassociation. It’s kinda like your brain flatlines or something for a second? I run into that and my psychiatrist prescribes the Strattera generic for it. I would advise speaking with a professional about it. I jumped around between a few different prescriptions before that.

I think I’ve experienced a similar things with the emotional void and aimlessness. Took some years to process past trauma that I think was the cause and I think things are looking up, relatively. If you haven’t already, speaking with a therapist would be a good idea. If nothing else, it’ll help you by just letting you say things out loud so you can hear it. Rubber ducking, basically. Therapists also have good advice and feedback, usually, too.

The Tunic OST if I actually need to focus on what I’m writing.

That was happening to me with the Fossify SMS Messenger app on F-Droid. Turns out it was the default settings.

Sending group/long messages as MMS and setting the MMS image size to no limit fixed it for me.