Please see your doctor or dentist. Only a medical professional should evaluate and treat your pain.
NEVER take other peoples med's escpecially anything for mental illnesses - many drugs for treating mental illness are psychoactive and can have unpleasant side effects for people who take them.
The drugs they gave you are not going to be a problem but they are also not pain killers.
Also NEVER EVER put your phone number in a forum post.
No you are fine. Do not worry, taking these pills one off will not damage you in any way. You are fine.
There is no need to do anything further.
They are not going to damage you. Relax
That is a very strange friend you have (maybe they were trying to help?). I would recommend not taking anyone elses prescribed medication.