I know where you're comming from. I get something very similar. I don't know if I can offer any suggestions but you can compare symtoms and maybe you'll get something out of it:
" When around external stimulus (lots of people, an airport, a shopping mall), and sometimes just alone, I suddently "Go away!" I am conscious but in my own world, in a tunnel so to speak, trying to reach out to my surroundings but unable to do so. This can last not for minutes but an hour or so".
I've been on anti-convulsant medications since 1979. (I also have ulcerative colitis which I also take medication for).
For the last few years, I have these staring episodes and speach arrest. I'm aware of what is going on around me but I can't respond. My neoro. says they are petit mal seizures, brought on by stress. It usually strikes after a stressful event, when your defenses are down. If I wasn't on the meds then these would be full blown gran-mal seizures.
I have been on the same meds since 1979 (dilantin and pheonobarbitol) and because of the long term use, It would be risky to change meds because I could have lower brain stem damage.
When I have these staring spells, everybody looks at me funny.
One thing that would happen is if I'm reading, all the words would be garbled for a few seconds.
In my case it's just something that I have to accept.
Diagnosed with epilepsy and ulcerative colitis in 1979,
Been on meds ever since.