Taking a ten day course of 3 pills of 500MG per day. I had insomn...

Taking a ten day course of 3 pills of 500MG per day. I had insomnia the first couple of nights. Some stomach problems and diarrhea. It is now the fourth day and I've been incredibly depressed and experiencing feelings of apathy and lethargy all day. Mood swings throughout the week; uncharacteristic short temper; general feelings of unhappiness or uneasiness. Also, severe headache that lasted for the second and third days - hurt so much it woke me up several times throughout the night.