Thanks to everyone with their support.
Sweetness, thank you for everything you wrote. I first read it all yesterday morning, but it has taken me until now to compose myself enough to respond.
I am finding it difficult just at the moment to talk here, but will get back to you. I appreciate your offer of support and hope to take you up on that shortly.
Thanks to you too Gottabrain, your posts are not offending me at all. Just the opposite.
I wasn't going to log in today but I didn't want to leave you in the lurch and I just thought of something important.
You mentioned he took more pills because he thought it would work better and then discovered he took too much. Yeh, they do that too. They don't learn or follow orders well and tend to think that more is faster or better. The Asperger's adult decided to use eardrops for twice the time the doctor required, in both ears instead of one, then ran out of drops and ended up irritating the other ear from destroying all the wax!

You get used to it after a while.
So if you want to prevent this from ever happening again (I'm sure you do!), then make a delightful ritual out of it and have him show you that routine, exactly, or show it to your ex-wife. For example:
Night routine:
Lay out pajamas. Put dirty clothes in hamper. Brush teeth, shower, put on pajamas.
Take out medicine. Place one pill atop tissue. Get glass of water and fill it to 3/4. Take pill. Drink water. Replace cap on bottle and put meds away. Put glass away. Tick off items on today's list as DONE. Turn on favourite music or read favourite book or watch favourite television show to relax more. Call Dad and tell him what you've done. Go to bed.
The more complicated and detailed, the better. Don't ask me why, but simple directions always seemed to get confused or made complicated but complicated, super detailed directions and rituals work well and are enjoyed. But the first few times will need to be done with someone else present so the habits are established.
ADDED: I think when you make it really complicated (lots of details and steps), it forces the Asperger's sufferer to focus on the job at hand. When it is simple, in his her mind he questions things or wonders about things and comes up with odd answers or conclusions. Lots of descriptive detail and doable steps, as many as possible. It is actually ENJOYED. Rituals such as this give them comfort. If you help define the ritual, then they can be positive rituals rather than negative.
Good luck to you. Everything will be okay. I'll pm you separately with info on the meds.
Sheila