I’d write some letters, clean up my apartment, arrange for someone to care for my cat after my demise and go park myself in the pasture with my horses and a bottle of wine and watch the sunset.
I’d take out a shot gun and go to the clinic and let them know they had about 40 hours more or less to find the antidote.
Call one of my buddies to make arrangements for him to represent my wife in the wrongful death suit, give a powerful video deposition covering all relevant issues including future earnings, etc. Then hop a flight to Colorado and indulge in all the legal weed I can smoke for a bit, timing it to come down in time to go on patrol, Buffy style, looking for a mugging to stop in my final minutes, thus earning my ticket to Valhalla.
I’d take my family somewhere fun. That’s what I like most. Might as well do more of it.
I’d make an appointment with a lawyer in 3 days, just in case they made an error concerning the error they made at the vaccine clinic.