banana berserker

ok my orange tree bought two years ago is looking very bad. when i got it it was in may and it already had 6 little green oranges. this year the tree is all yellow and wierd colored and just today i found the start of two little blossoms. It looks terrible and is blooming extremely later than last year. I'd be very greatful if you guys could tell me whats wrong if anyone has any tips on growing oranges that would be great! i live in california zone 9. Thanks!