From the time of the effects, I'd say, Waxwing. As diagnoses are not the thing, but the effects. The diagnosis will serve to confirm he has had the condition more than 3 months and if several years ago, boosts credibility that the effects will last more than 9 months, as it already has. [not absolutely certain of 3/9, mods will change if wrong]. But you get the idea I'm sure.