Good morning I am sorry to hear about your ill health Blood in the vomitus is a symptom of concern which may indicate a tear, ulcers or inflammation in your esophagus, stomach or duodenum. Since you had two episodes over 8 weeks, stringy blood, stable CBC and hemoglobin i dont suspect any serious disease inside. But you need an endoscopy for evaluation of the same. Please make sure that you dont consume any medicines that contain aspirin or analgesic type medications which can be the cause or worsen your bleeding I hope this can answer your question I would be happy to answer your future questions Wish you a speedy recovery