Hi everyone, Here Iam thinking of quitting my Phen , Im so confused

Some days I feel good others really hungry, I lost weight but together the sex drive

I usallly take my phen early in the morning 1 hour later eat, breakfast during the day I feel good for 6-9 hours then I crash, feeling tired, & sleepy, sometimes very hungry.I eat and it goes awayy for the rest of the day.
I drink lots of water, try to eat every 3 hours and keep my Cal intake in the 1500.
When I take the phen in the morning around 6-7, half hour later I feel wired lots of energy, dry mouth and unable to talk clearly,kinda of tongue tied I sometimes forget to finish a sentence is like tamporay memory lost.
Every day is different I dont know whats going to happend.

Monday I start school to become a certified nurse assistance and Im afraid I wont be able to concentrate in class . tomorrow be a week I stared the phen, What should I do??? will this side effect go away? any advise?
Thank You.
D