Feeling bad -- at rock bottom? (4,3)
I believe the answer is:
laid low
This clue is a double definition.
'feeling bad' is the first definition.
(laid low can mean unwell)
'at rock bottom?' is the second definition.
(laid at the bottom)
(Other definitions for laid low that I've seen before include "Brought down" , "Hid away" , "Felled" , "Indisposed" , "Put out of action by illness" .)