I got the Gardasil shot 3 days ago , ever since then i been feeling really depressed & i cried for no reason? What should i do?

Talk to someone you trust and call a doctor.
I have no experience with many shots, etc.... I just don't believe in a lot of it... but realize this one may be causing a reaction in you and you need to make sure you'll be okay with it.

Depression, mood swings, and crying are not among the reported side effects of the drug. The chances are it's unrelated, since it apparently has not happened to anyone else.