Green’s Dictionary of Slang

fenneh v.

also fenny
[Twi fene, to vomit; Fante fena, to be troubled; Lumba feno, to faint]

(W.I. Rasta) to feel physical distress or pain.

[WI]Cassidy & LePage Dict. Jam. Eng. 175: fenneh, to suffer.
[WI]O. Senior ‘The Boy Who Loved Ice Cream’ Summer Lightning 85: Stan still yu jumbo-head bwoy or a konk yu till yu fenny.