Taking 30 mg Phen

Hi, thanks for the add.

Had an abdominal hysterectomy on 9/1/2017 and gained weight , Im currently at 155, 5'1.
Doc prescribed phentermine 30mg cap on 11/19. 30mg made me sick so i started taking 1/2 of it in the am and 1/2 in the afternoon. My appetite is not suppressed as I am struggling. any suggestions?