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The duration of symptoms presenting grossly varies following trauma to the head. Symptoms can be immediate in a few cases and in other cases it can occur as long as a week later.
The sore bump was an immediate scalp hematoma
that developed following the injury
. This is not a concerning problem which would resolve in a week's time. However light headedness and blurry vision suggests possible concussion
. These symptoms can last for a while and it needs to be carefully monitored.
Usually a CT brain is needed in such cases to confirm concussion. I would advise you to consult your doctor immediately if symptoms worsen.
Hope this helps.