When i first applied for SSI , it took me numerous times , I was denied four times. I had to get an attorney who. specialized in cases like ours. You have to go through a lengthy process , but if you cant work due to your illness this can really help you out. If you are denied , don't give up , because the more you keep trying , you will eventually get it. And you can get retroactive SSI going back to when you first applied. You have to have all your evidence proving your disability. Make sure however: that SSI doesn't send you to one of thier doctor's they work for SSI against you, not for you.