Sleep advice

Hi I need some sleep advice. My 1 year old has always been rocked/held to sleep its what worked for us and stuck however after a year of disturbed sleep I'm really struggling with the exhaustion now. I have tried control crying and first night wasn't too bad he cried for 30 mins but the second and third night within 2 minutes of leaving the room he was crying and physically sick everywhere so gave up as don't want him to make himself poorly. That was last week and now I'm too scared to try again incase the same happens but really need him to settle himself to sleep. He also sits and stands up crying if I try to lay him down in his bed now. Any suggestions?!