Is the time that I'm serving in Riverside County going to run concurrently with the time that I am facing in another county?

Doubtful. The notion that you would be "rewarded" by credit for time served on another charge and thus were violated on your prior is not tenable.

My fiancee son broke into our bedroom with a padlock on it & stole some perscribed drugs, but later returned them after being

Yes and yes.

Can I ask the Judge For An Extension on a probation violation ?

Possibly. Have a local attorney review it.

Can my job fire me due to a positive drug test that is caused by my own prescribed medication?

Probably not. If it becomes an issue, consult with an employment attorney.

How do I get a juvenile felony off my adult record? Can I fight this charge 11 yrs later, after truly being innocent?

You can seal the juvenile record. Contact probation.

Not that I know of. DMV is different than the courts

If you were stopped for a open container and was on probation, how long do you have to wait to see the judge to set a bond

21 days and/or reasonable bond.

Should I plead guilty or not guilty on an MIP charge?

Never plead guilty. Talk to local counsel.

Can I be charged with a crime after 12 years has passed?

FROM YOUR FACTS, NO.

What will my charges and fines probably be?

Attorney Now!