You absolutely have the right to seek a second -- or even third -- medical opinion when you don't think you're getting good medical care. You also have the right to change doctors simply because you don't like the doctor you have.
Of all the different federal offenses that someone can be charged with, mail fraud is perhaps the most common one.
You were arrested, bonded out and now face going to trial on criminal charges. At some point in the court proceedings, you may be approached by your criminal defense attorney to "cop a plea." Is it in your best interests to do so?