I get strained terribly and fall apart (12)
I believe the answer is:
disintegrate
'fall apart' is the definition.
(I've seen this before)
'i get strained terribly' is the wordplay.
'terribly' is an anagram indicator.
'i'+'get'+'strained'='igetstrained'
'igetstrained' with letters rearranged gives 'DISINTEGRATE'.
'and' is the link.
(Other definitions for disintegrate that I've seen before include "Decompose" , "Lose all cohesion" , "Crumble" , "Shatter" , "collapse" .)