"get stuck" ???? If your body isn't producing or using the chemicals you need for happiness, why would it matter if you can get them through a medicine?
What would happen if you DID happen to take them for a few years or even the rest of your life? What could happen if you don't take them and need to?
I'm sorry this has you concerned. Perhaps it is part of your depression, also... and hope you can begin to eliminate the cry ing and feeling this way soon.