blood in vomitings is usually from stomach and it is not bright red but brownish red and mixed with food.If it is from lungs , it is of bright red colour and not mixed with food.
You should not take spicy food , drink cold milk.Take an antacid
gel like Digene
For vomitings tablet Doxylamine
is safe but should be taken under doctor's guidance.
Do not eat junk food
If still persists consult a physician.