I Haven't Been Eating For About 4 Months Due To

I haven't been eating for about 4 months due to being scared of choking and recently I vomited, but it was light pink. Before vomiting, my vision was a bit weird so I sat down and rested, it was about 10-20 minutes before vomiting. My stomach also hurt. After vomiting, I started shivering a lot, even though it was around 90 degrees. When I got home the shivering became worse, but blankets helped and calmed me down. What does the pink vomit suggest?