WELCOME TO JUSTANSWER,
FOLLOWING ARE somptoms dizziness,headache, nausea,vomiting and symptom due to gastrointestinal mucosal ulceration,abdominal distention due to paralysis of small intestine ( paralytic ileus),
Gradually low blood pressure( hypovolemic shock), low and then nil urine output due to acute renal failure, and coma have been reported.
Regarding duration of period from consuming the poison untill death, it will depent on amount of poison ingested,
hoping help you
GOD BLESS YOU