Hey everyone! I'm new to this forum. My doctor prescribed phentermine for me exactly a week ago - 15 mg 2/day. I started out taking the prescribed dose, but found myself not sleeping. Then, this past Thursday, have reduced the dosage to one around mid-morning (since my worst time of day to eat are lunch and afternoon snacking). That has seemed to help the insomnia, BUT I am having headaches and am really tired and irritiable. . . Is this something that will get better as I go along? I was hoping that since I've only been on Phen for 7 days that my body is still trying to tolerate it and adjusting. If anyone can give me some advice out there, I would really appreciate it. Do I need to stick with it??? Or, stop???? I really appreciate anyone's advice...THANKS!