The degree is a Juris Doctor and not a Juris doctorate. Some have said that a J.D. is useless without passage of the bar. That could not be further from the truth. There are entire articles and...
Yes. Whatever that means.
Yes. A Medical Career
Whether or not an attorney is disbarred is up to the State Bar Association of which they are, or desire to be, a member.
All defendants are allowed to represent themselves pro se if they wish however most judges will strongly caution them against it.