Hi there ~
I understand your concerns. The black spots in the saliva, pain on swallowing with a history of smoking
drugs is probably due to the cocaine. If you have stopped using kudos to you, however you will probably going through withdrawals and need to see and consult a psychiatrist
who specializes in substance abuse
disorders. I also believe that you may be at risk for many medical disorders as well due to your regular cocaine usage. I hope you consult a qualified doctor as soon as possible.
I hope this helps. Take care and have a lovely day!