Conversation so far:
How did Gregg Allman spend Gregg Allman's final years?
After the dissolution of the Allman Brothers, Allman kept busy performing music with his solo band.
Was he very sick during this time?
his health problems remained; he had atrial fibrillation, and though he kept it private, his liver cancer had returned.

Question: How bad was his atrial fibrillation?
Self-contained rewrite: How bad was Gregg Allman's atrial fibrillation?