Cgms can be very frustrating (mine has an occasional habit of going off low all night when I've put it on that day which drives me up the wall) but please don't do anything rash.
Your situation sounds as though it is a medical emergency. Please call 111 and/or 999 as what you posted is deemed an emergency that requires medical attention.
Please, if you are struggling with suicidal thoughts, consider contacting Samaritans on 116 123.