What Are The Repercussions Of Repetitive Vomiting?

Question : I throw up a lot from having an anxiety disorder. I was dry heaving hard today into the sink and throwing up just regular yellow bile as I haven't eaten anything today. A little black mucous looking chunk came up, a little smaller than the size of a dime. When I put it on a paper towel it smeared a brown streak. My vomit since has been clear of chunks, so I don't know if it's serious or not. I tried google and can only find articles on black coffee ground specs. This was not a "spec" and not multiple specs like coffee grounds, just one black a little smaller than dime sized ball. It kind of looked like, pardon for the gross image, but a miniature version of the black chunks passed during menstruation, but it smeared out once on paper towel. I kept throwing up after the chunk came out and it was only water and yellow bile, no more chunks, but am I in danger? I have included a close up picture, and a picture next to my hand for size reference of the smear.