I am a freshman in college and have been on singular since tenth...

I am a freshman in college and have been on singular since tenth grade. I was supposed to take 10mg of singular every night but i was always forgetting, it was not until Junior year that i started taking it everyday on time. Then Junior and senior year i got really depressed, and i would always cry to myself. At the end of senior year i got diagnosed with ADD and started taking focalin, for awhile i felt better. But lately i have been feeling depressed 4 days out of the week and i hate it because its making my freshman year difficult. If this really is because of the singular, how long will these side effects from singular wear off?