Hey, Jude.
Don't worry about it. Your problem is easily solved with a transplant. Depending on the depth of the rot, you may be able to get by with a mere head transplant. At any point in time, did you throw your hands in the air, as if you just did not care? If so, we can chuck those in the bin. Was there any attempt to shake something off? If so, your case may be a bit more serious.
To prepare, use a fingernail clipper and trim a tiny sliver from your left pinky fingernail. Put that small piece in a plastic bag to keep it isolated. That's the part you get to keep. The rest gets thrown away. Sorry.