our vets love to see our hamsters
i wouldn't worry to much about drinking loads, sometimes hamsters drink lots of water and sometimes they drink hardly anything.
as long as your hammy is getting water and is still hydrated, i wouldn't worry. you can test to see if it is dehydrated by pinching it's scruff. If the skin goes back to normal very quickly, it's fine but if it's slow, it may be dehydrated.