Threw up blood should i be worried

i was drinking lots with my friends and i probably threw up 12 times in a night until the point where i wasnt even throwing up anything besides bile. I went back to my house this morning where i threw up a couple more times where i noticed some coffee ground looking things in my vomit. There is no blood in my stool and i dont have any pain in my stomach. Im very worried that im gonna die and i cant go to the hospital because nobody is gonna drive me. My sister that is a nurse said that i should be fine and not to worry about it unless i throw up again tonight. Please help me im so scared.