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If the bleeding is minute, then you can wait.
Small amount of blood can come with vomitus from tear during forceful vomiting.
In such situation, you can wait and observe.
As you are feeling tired, if the amount of blood was significant, then you should consult doctor asap.
You should not wait for scheduled evaluation by a gastroenterologist.
Though the blood vomiting has stopped, still you need an evaluation urgently.
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