Appendicitis<br>Joe didn't feel well after work. He had very bad pain in his abdomen. Joe went to the emergency room. It was discovered that Joe has appendicitis. Surgeons removed Joe's appendix.
Joes have never felt much better. 
according to the text Joe is not feeling well, so the expression used means he is feel better than ever. 
( z1 feel :polarity - :ARG0 ( z2 person :name ( z3 name :op "Joe" ) ) :ARG1 ( z4 good :ARG2-of ( z5 have-degree :ARG1 z1 :ARG3 ( z6 more :quant ( z7 much ) ) ) ) :time ( z8 ever ) )