growing conditions for peppers

I've had this peppers plant for 3 yrs now, indoors in the winter n bk in2 the greenhse for the summer.
Anyway it's been in the greenhse for a mth now n it's not happy at all....looks like it's about to give up n die on me!
I have'nt done anything different so I dont no where I'm going wronge?
Do they like lots of water or only a little? maybe im giveing it to much, or not enough?
Do they like full sun or shade?
Please help me if you can.
thanx ever so amanda cornwall
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