To those that had the Depo shot

Annette
I got the depo shot at the end of November. This month would be the month to get my next one but I've decided not to. I don't like how it's made me feel and since I'm not in a relationship I don't really see the point to continue. The thing is lately I've been feeling worse and I'm wondering if that's a sign it's wearing off. 
These are my symptoms: bad nausea, dizziness, smells have been really bothering me making the nausea worse, fatigue, painful cramps, lack of appetite and very sore boobs. Yesterday my nausea was so bad even though I didn't eat very much all day. As far as the dizziness, sometimes I'm sitting down and all I do is turn my head and the next thing I know I'm dizzy. 
I've only had one shot so I don't know what to expect as it wears off. If you've had the depo shot and are no longer on it, can you tell me your experiences as it was wearing off.