I applied online at home and was approved in three months. AmandaLouise does a good job of explaining things.
That said, I was in an active local support group and we all had the same condition and it took one lady three years, but she was approved.
I’ve received and still receive treatment, but I’m treatment-resistant for my main condition and have never has a remission. I have a really thick file (files), as I keep trying and I’m in good care. But...I’m disabled. I’ve been reviewed...still disabled.
Taking your time filling out the application to thoroughly answer helps. The government will gather all your records (that was a huge relief to me)....the form is where you explain how your functioning is in a day to day basis.