Lexapro withdrawal (SSRI withdrawal in general) is pretty terrifying. Don't underestimate the zaps - dubbed the "SSRI discontinuation syndrome" by psychopharmacologists.
Zoloft overdose alone is rarely life-threatening.
Zoloft has a tendency to promote weight gain, an undesirable side effect for many patients. The effect of Zoloft on weight is relatively modest compared to atypical antipsychotics like Seroquel (quetiapine), which have pronounced metabolic effects independent of their appetite-stimulating effects.
Anxiety medications can be life-changing for people with generalized anxiety, panic disorder and obsessive compulsive disorder. But they come with serious tradeoffs. Benzodiazepines are unquestionably effective for anxiety but have adverse neurological effects like memory impairment.