Greetings Welcome to Healthcaremagic. The most common blood thinner or anti platelet therapy that is generally advised is salicylic acid , which is given in a wide varity of condition and many times just to prevent stroke or heart attack.And the most common side effect of salicylic acid is gastritis it taken on empty stomach or if not taken in enteric coated preparations. Gastritis means inflammation of the stomach which is caused when the protective barrier of the stomach is removed by such medication . Nausea and vomiting is usually due to gastric problems and i see gastritis due to blood thinners as the cause which is most likely. But there are other causes also . if after taking proton pump inhibitors like pantoprazole with blood thinner , the problem still persists then it is advised to visit your doctor who will do examination and write some important tests to rule out other problems. I hope the answer was helpful. In case you need any further assistance feel free to contact in writing. Regards. Dr Talal Hussain