It's possible that other things (like the heat, or a virus) is causing these symptoms. However, I've been on antidepressants for the past 4 years, and I will occasionally get these breakthroughs of side-effects / symptoms. They usually go away in a few days. BUt if yours continue or get worse, definitely speak with your doc about the medication.
Go back to your doctor, it sounds like they many have to increase your dosage.