With interjections, people usually use exclamation points. Others use dashes but it's not very often.
Ex: Dang it, I forgot to write me name on the bathroom walls!
Ex: He drove- very quickly- to Wing Stop for free wings.
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The advantage is the specialist will be able to give you more info on what is wrong and a primary care physician can only give you as much info as they know. Like if your arm was broken you would want to go to a specialist because they know about more and a physician if you have a common cold.
John Proctor says that to Mary Warren in the Crucible.