Persistent hiccups and presence of blood in the vomit are both rather serious problems- he might have ripped some blood vessels in his gut or there could be a ulcer and a metabolic problem. It is better to see a doctor but you could try these first- The vodka should be kept to a minimum, if at all; he should have plenty of (cold, not chilled) water, fruit juice, milk shakes and non- spicy, non- fried foods at frequent intervals. Intensive counselling should also be given a try to recover from the PTSD without depending on alcohol for relief.