Is it possible that i have ocd, sad, autism?

Hard to say: You ask a question with no background information. This makes any valid answer impossible. You can start over ( site questions are not linked), give background information, and someone may be able to answer.With no information, no reasoned answer is possible.

This combination is: Possible. If you have symptoms suggestive of these conditions i would encourage a comprehensive psychiatric evaluation. Once you do this - a treatment plan can be developed.