I've Been Losing Weight At A Very Fast Pace, 3

I've been losing weight at a very fast pace, 3 months ago I was 179 I weighed myself about a week ago and I was 161 and I weighed myself last night and I was 151 and I don't even work out or exercise... I have no appetite, I only eat because I have to and when I do eat it takes me a while to eat because I have no desire to eat so I just chew my food for a long time... I also threw up last night and I felt fine all day until about 7pm. I felt better after I threw up but in the morning today on my way to work I threw up again while I was driving. so I was wondering what your insight might be on this