What are side affects of zyban/wellbutrin?

I'm now on zyban/ wellbutrin I was feeling very nervous parranoid
scared. I was hearing & seeing things I knew werent there.
I was reading on numerous websites that this is not a side affect of this drug.
I want to know what went wrong?
should I be taking this?
Update: I also am having problems sleeping.
this has never happened before; ever.
I just didnt understand what was happening.
Its the long weekend I doubt my doctors working...
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