Daydreaming is ruining life. Dont know.

Dear doctors , whenever i wake and began studying after 10min i began getting suggestion in my mind to daydream,then once i began i began making one story,other and so on,if i stay motivated for a day then next day i get demotivated bcoz i began doing daydreaming ,i blame it for spoiling my day,i really regret a lot for daydreaming ,i feel so bad imagining unreal scene in my ..which once dosnt stop,i would take medication,i researched for flvoxamine,SNRI helps in this case,my life is getting spoiled, my mother and father will stop educating if this time i didnt gave them the result..they dont understand whats going in me,i make expressions when imagining which sometime people notice,my head gets heavy when i daydream for 2hrs.so i dont get interested to do the things.please help.dont know whats wrong with me ,is it controllable and i am making excuses,i dont know.i have tried for things but lose hope and don't stay consistent doing, now medication is one i want , atleast for 21days.