relapsed
re-lapsed
verb
Returned to a previous, often worse, state or undesirable habit after improvement.
"She relapsed into depression after a period of wellness."
Thesaurus
Synonyms: recidivate, relapse, fall back, lapse, retrogress, regress, lapsing, backsliding, reversion, reverting, relapsing, get worse
Antonyms: bounce back, get over, get well