Sorry if I frightened you, SoScorpio. That was not my intension. The most important is to understand that doctors need feedback from their patients, even if they are professors, to find the right medication or combo of medication that really helps. Trust your doctor, but tell him/her how the medication worked on you, so he/she can adjust them to the unique person that is you. Ask how long you are to use a medication before you can expect to feel better and ask for when to contact the doctor again. If your GP doesen't know that some people can get "bipolar symptoms" by using some types of antidepressants, I would have found myself a new one if I were you.

Bipolar III is not an official diagnose, but it is known that some people become manic or manic-like if they doesn't respond well to some antidepressants (usually SSRI).

An article from PsychCentral about "Bipolar III":
Antidepressant-Induced Mania Similar to Bipolar Disorder | Psych Central News

Hope the article makes the topic more clear to you!