YOU MUST SEE A DOCTOR AS SOON AS POSSIBLE. You have every reason to WORRY. Your description may mean intra-cranial injury.
A bump is less of a problem than others - there are some serious leads...
Your 'sleep' could have been loss of consciousness!?
Bleeding from the nose - nose may just be the exit point; bleeding may come from higher up - say brain injury
Feeling 'faint and sick' - could also mean pressure inside skull may be increased. Codeine
(co-coda) can cause drowsiness
and confuse the issue.
So is slurring of speech
It is dangerous - risky - to 'wait and see'. You need to see a neurologist
and have CT scan
to exclude brain injury. I am sorry to this - but it is better to be safe than sorry. Don't delay