If they didn't say you needed bloods then there is no reason really why you should go and get these.
The blood will more than likely just be from the pressure put on the little blood vessels when you vomit and those bursting a bit. As well as that, if you've vomited a few times the area will be inflamed bringing these closer to the surface and more vulnerable.
Good things to eat at the moment would be things that are light on the stomach such as rice/ pasta/ chicken/ white fish/ a veg based soup/ bread. Definitely not red meat or anything like curries at the moment. And yes, stick to small amounts but I would recommend these relatively regularly but if you have been restricting for some time (I don't know whether you have or not) then don't suddenly drastically increase what you're eating, a small increase would be fine (and good) but more than this can cause damage and seeing a dietician would be the most sensible thing in the long term to come up with a meal plan if this is the case.
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