The problem with much restaurant food is the use of highly unsaturated
fats that have little antioxidant protection to them (some are so bad
you can taste the ranciditiy).  Try making your own Chinese food with
soy sauce, sugar, salt, etc., but use fresh coconut oil instead of any
other oil and see what happens.  I'm not saying I know it will "cure"
your "diabetes," but it would be worth it as a one-time experiment.
Sugar is a problem after your body becomes dysfunction, not before.
There is a common misconception that eating a lot of sugar will cause
"diabetes," but think about it - if that were true, almost everyone in
American would have diabetes (I'm talking "type II").  However, the
"diabetes epidemic" has happened as consumption of refined, highly
unsaturated oils has surged and consumption of antioxidant-rich food
has declined.  The cause to the "chronic diseases" is what's known as
oxidative stress (free radical damage), and there are simple things you
can do to avoid the worst aspects of it.

I'd be willing to bet that the culprit was actually the rice.  However,
"several days to return to normal" doesn't sound right; several *hours*
would be more like it.  Are you sure you weren't coming down with some sort
of infection?  That can cause a prolonged increase in BG.

Dude,
What do you think rice is composed of?