Any depo shot horrors?

I have gain 40 lbs on it during the 3 years I have be on it. Without changing my consumption and exercise habits. I know when i have the depo shot I just didnt resembling the thought of the medication getting injected into me like that. I know population have have a hard time getting pregnant after getting stale the shot cuz it kinda tricks your body into getting pregnant now I hold the IUD and love it.
My friend had a similar experience, she gain about 30 lbs. contained by the past 2 years of anyone on the Depo shot. She is now sour it, and struggling hard to lose the cargo.