I think Adam is going to die. I said it before, when his character was off the canvas for so long, that I suspected David Canary's health was failing. I believe this latest storyline with Adam's mystery illness is leading up to his departure. David Hayward just "upped the dosage" of whatever it is he's giving Adam, so this will be another murder for which there will never be anyone brought to justice. The drug he's slipping to Adam will, of course, be undetectable. After all, we couldn't allow David to pay for any of the horrific things he's done since the first time he blew into Pine Valley! Who among TPTB can possibly believe that we ENJOY watching anyone constantly get away with perpetrating so much evil? I simply do not have the stomach for it.
The apparent murder of Dr. Chappell by whomever was at the door is not the "big death of a major character" that we are expecting for May Sweeps, but it may be related. Did Adam or David send someone to shut him up? Both of them had plenty to lose if Chappell talked about the flaw in the valve. Hmmmmmm