I have had a patient who had the same issue. She had a sudden outbreak which flabbergasted her significantly (used to have clear skin). She consulted dermatologist and was given some doxycycline for 6 months. Finally she stopped and decided to seek a second opinion.
The point of my story is- You should give it some time for the treatment to work, something like 6 weeks is fair. However if it is obviously not working after that duration, and worsening, you need to consider a re-evaluation.
I am not a fan of doctor-hopping and maybe a thorough discussion with your doctor now may help to allay some of your fears and concerns.
Hope all is well!