Sometimes you need to build the medication up in your system. It depends on your prescription, call your pharmacist and ask, they will give you all the information you need and it is free to talk to them
This will depend on your condition because most antidepressants are only to be taken when depression is severe. This means that if you are no longer depressed, you can stop the medication but it is important if you talk to your doctor. Read more on http://www.mayoclinic.com/health/antidepressants/HQ01069.
It can matter. That's a common problem with people who take anti depressant. It takes time to figure out which and how much of a given medication works for each individual patient. But once the patients stops taking it, Often times that medication no longer works. And then they have to go through the process of having their doctor figures out what works them using more powerful medication with increasing side effects. Eventually non compliant patients are ultimately in danger of exhausting their therapeutic options. You need to let your psychiatrist what's been going on and in the meantime you should resume your medication as directed. Call your psychiatrist today it's important. Good luck.