Okay, first off something isn't right with that lady to start off. She's obviously entitled, etc. But sounds like she has moods of her own. Maybe she's untreated in something. You never know... she was already hostile and so on, then her note back.... well, irrational really.

Secondly, time to contact your support person or therapist or whoever helps you through suicidal thoughts! If it is normally your boyfriend it would be best to choose someone else today. Or if you think it is serious head to the ER if you have to. Just stay safe!!!