Thanks for writing in.
I do not think all these are connected but i can help you with what it probably could be.
1. As far as the bouts of vomiting are concerned, it could be either a gastrointestinal infection
( which is common after eating out ) or cyclic vomiting syndrome. The latter is probable since he has already had 3 bouts of severe vomiting
in the last couple of months and there is no nausea
or vomiting between these episodes. This would be treated with a proper diet, plenty of sleep and drugs like ondansetron
when he gets vomiting.
2. The pain in the ear could be an infection and it needs to be treated with antibiotics and pain killer.
3. Reddish hands with white blotches could be just an allergy
which is more common in children with asthma.
I would suggest that you see a paediatrician as each of these conditions merits an evaluation.
Hope this helps.