Hi. I've been drinking with phentermine for few years. I've quit both now. I needed the phen to make me seem alert from the drinking. I quit in the fall. But odd u asked this. Exhausted constantly. I've been thru a few serious health probs but the fatigue just hit me hard on Friday. I'm hoping to ignore it and push thru. Hoping it's just our bodies way of healing. Making us slow down. Don't have to get it ALL done today. I didn't for my walk this am. But I did go to the gym. And I stayed. I just lightened my load. I also ate more today. Even bread. Yikes. And some Girl Scout cookies for energy.