I've been on sertraline for years, stay on a maintenance dose of 100 mg and have been pretty steady for years despite a number of challenges. However I have lost interest in everything the last few months, everything either bores me or annoys me or I just can't be arsed to bother with it. I'm listless and apathetic and find no pleasure in anything. I welled up today when I saw someone having fun...and I think I twigged that I'm not right at the mo. Could my AD have stopped working? I have been on it probably 8 years. Should I up my dosage or try another AD? Anyone had a similar experience, how did you resolve it?