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Taming takes time, don't expect a young ham to sit still on your hand or anywhere else for long, it doesn't mean they're not tame but that they are full of energy & mostly just want to run around & explore!
Do you have a play pen, bath tub or other safe escape proof place you can put your ham to interact with him?

You only need to feed once a day, some people feed less frequently than that, if you want to interact with your ham you can offer a little extra treat or some food on your hand but he really only needs about a tablespoon of food each day.
They don't often over eat they normally just stash extra food away in their hoard.

Is your ham drinking, peeing & pooing normally?
If his abdomen is bloated then he could be constipated or there could be something else going on with him, the hiccuping for that long is a bit strange, I know they do do it sometimes but it does sound as though he may have a bit of a problem.
If you're unsure it's always best to get a vet to check them out.