I can understand your problem and most patient gets more anxious with skin problems specially on the face and specially if it is for long time.
The question remain is what you went to get treatment for, that the medicine caused acne because it is not clear here that what you went to get treatment for in the first place.
Some internal troubles might come out during healing process as acne but it shouldn't be for any time longer than 1 week.
Next Steps
Did your doctors take your full case and analyzed it and then gave medicine?
If not, then I know that might help since you need a complete overall medicine, not just for one particular disease.
Health Tips
The decision is upto you to decide if you want to go for the third doctor or not and for how long! and if you do, please make sure you completely tell all your symptoms and history to your physician and have faith and trust.
Good luck.