36 hours ago I was on a run when I started to feel very sick. I could walk about 1 minute before having it sit down. Eventually, I threw up a black tar like substance. The night before, I did have about 4 beers with dinner. One was a darker beer but the rest were light and I ate a full dinner and drank water. Since then I have a very low appetitie, although I have Made myself eat, and I haven’t had a bowel movement since then. I am very regular so this is odd for me. I also have some ache in my shoulders. Do I need to see someone about this or can I wait?