Hello. I have been taking Phentermine 37.5, 1 per day, since September 1st. I have been feeling very agitated and ill, which is unlike me, for a few weeks. I stopped taking the medicine about 5 days ago and thought maybe it was better, but today I feel the same agitation. Could this medicine be what is causing me to have those feelings and what can I do to make them go away? Please let me know. I am 63 in case you need to know my age. Thanks.