You don't get high on anti-depressants; it's nothing like an addict taking pills or doing drugs. Depression is a medical condition, just like diabetes. Anti-depressants treat the medical condition; they are not a crutch.
When you suffer a loss, the levels of certain neurotransmitters in your brain may fall. This can cause depression. If you continue to suffer from the loss, or you suffer additional losses or major life events, your brain can have difficulty "fixing" those levels. If you want, you can try adding omega-3 fish oils to your diet first (atlantic salmon and walnuts or a supplement) to see if that helps. Exercise is also a natural anti-depressant.