Its normal to get a lil headache after a good spar right?

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I heard Calzaghe doesnt spar much only when it near the bout he spar lightly

Thats because he fears injury to his hands which are weak from many breakages. (mainly because he throws so many punches a round).

As for the headache - i often get them whilst wearing my headguard. Maybe your headguard is on too tight, to much pressure. Try getting someone to undo the chin strap inbetween rounds...or perhaps getting a larger side?

Like the others said too - keep hydrated and if the pain is severe don't carry on.