My first question is,
Why is the fan making a noise if the head gasket has gone?
If the head gasket goes you get a drop in coolant level, a drop in engine power, oil and water mixing. A head gasket is either broken or not.
As for not revvin when cold, thats not right. If the ehad gasket is not a good fit then you would get a car with no coolant in when left over night. A head gasket seals the join between the block and the head at all times even when cold, hence why the headbolts are torqued up, to sandwich the headgasket.