Forgot to add if you are afraid of the drive dying you should do a entire clone of the drive as soon as possible with something like CloneZilla since every second you use it is a risk for it failing.
I don't know the size of drive and how much you got on it but also worth keeping in mind if not cloning it first is that the WinUAE route is a lot faster then via PCMCIA, so personally I would do it that way instead of PCMCIA if copying from a dying drive, since time = risk.
Does CloneZilla clone an Amiga drive? Does it need to be on the IDE bus or can you use an USB adapter?