not sleeping for years

the question is what else can i do to fall a sleep ? i was dianognosed with sleep apnea about a year ago . but talking with my wife and my family doctor , we came to the conclusion that i had a form of sleep apnea for atleast since i was 15 ( i'am 39 now ) . i have tried staying awake for hours and hours and just finally crash . i have went to the sleep center last year and got the machine and is at # 19 right now . for a while did help me sleep but after a while just did not do the job . and i have tried most of the over the counter meds ( some i could not with my regular meds ) and really did not do the job but helped a little bit . the doctor gave me a script for ambian and after a while trazodone  and that does not work either . well i little history of me so to understand a bit better . i'm 39 , had a sleeping problem for going on 25 years , been over weight for well .. all my life . the jobs that i had were demanding . i worked in the automotive business , selling delivery . and i went truck driving over the road for a bit . i'am the only one left in my family . mom and dad are both dead .i have a wife that is so helpful and understanding . i got injured with my last job and been disabled ever since . and i had the weight loss surgery last year in april , just before the surgery i was at 340 now i'am around 250 , but having alot of problems still with the surgery . right before that i was taking 13 different pills a day plus lantus insulin 2x a day plus regular insulin coverage shots thru out the day . after the surgery went down to 3 pills a day and one insulin shot a day . plus i have depression and just about to the bipolar ordeal . and really never talked about it in the open like this and my doctor and wife thought it might be a good idea . so here i'am . and hopefully i will find some ways to get some answers and/or help with this problem .