The brain fog may mean that you are taking too much so ask your doctor about changing your dose, or prescribing a new medication.
I was once on anafranil and after a few days of making me sleepy, I had enough. I was fine without it. If you are open to alternative therapies, you may want to consider going to a qualified accupuncturist who may prescribe herbal remedies that may be effective without the side effects.
Good Luck