I'll be honest...
A good amount of the "Doctors" who will write you the recommendations, require only that you have one of the symptoms. (Chronic pain is most common.)
You could go in there and say you have pain in your back all the time, because you twisted it playing B-Ball last week, and pain meds make you sick to your stomach because you don't have an iron gut.
A: This does legally qualify you
B: Keep in mind, if you're ever legally challenged on the legitimacy about your recommendation, the doctor has to have at least SOME valid evidence that the treatment was for good reason.
So far as you can do that, you're fine.
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Disclaimer: Everything posted by this account is completely false, fictitious, and complete lies. I make it all up to sound cool. (And not get arrested by the FBI.)
Favorite "Stoned" Song: Mind Control - Stephen Marley
Addiction is a bullshit excuse made for those without the ability to moderate.