Seeing blood in your vomit, along with stomach pain and acidity, suggests a condition like a peptic ulcer or severe gastritis. While these conditions are highly treatable, blood in vomit requires prompt medical evaluation. Please consult a doctor immediately; they may suggest an endoscopy to locate the source. For acid relief, generic proton pump inhibitors like omeprazole or pantoprazole, or H2 blockers like famotidine, are commonly prescribed. Avoid self-medicating and do not take pain relievers like ibuprofen or aspirin, as they can worsen stomach bleeding. Rest, sip water, and seek professional medical care right away to get the correct treatment.