Sorry to hear about this SoScorpio! It sounds scary that you almost became manic. Since some antidepressants may turn people into bipolar, I think the best you can do is to go back to your GP and tell. (I tried to read about your medication, but wasn't able to find out if it is among those that can lead to medication induced Bipolar Disorder, That is Bipolar III). Please go back to your GP. Doctors, even psychiatrist, do "try and see if it works" when trying to help. If the medication doesn't work as intended they need feedback.

Wish you good luck!