Thank you. OK, no, you can not draw disability because disability is merely early retirement without the early retirement "penalty" - that people can take if they are under full retirement age but can't work due to disability, so they don't have to wait TIL their full retirement age to get it (and starve in the meantime). In your case, you are already getting your SS benefit, so there is nothing else to get. It is either disability (under FRA) or retirement (over FRA).
As an aside, it is unclear if your doctor meant you can not do anything easy, full time, or if they are saying you are bedridden and really can't do anything. But if not the latter, consider looking into the possibility of part time gentle work you enjoy, that can also help you supplement your SS, at least for now.
If you could earn a survivable income, or otherwise get by, you could suspend your SS benefits til 70 and succeed in increasing your benefit by 16% (8% per year) by age 70, at which point you would start up collecting your benefits again.
I hope this helps! My goal is to provide you with excellent and accurate service – if you feel you have gotten anything less, please reply back, I am happy to address follow-up questions.
Kindly rate me "excellent" when you are done. I look forward to assisting you in the future, should you have legal questions. Be sure to start future posts with "To ***** Esq., ONLY" if you want me to specifically answer it.
Sincerely, ***** ***** Joy, Esq.
Your online SS legal resource