Why in pain in my head left and front side

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What are the cause for headache in left side ?

1.migraine 
2.sinusites '
3.stress headache 
4.cluster headche 
5.dilatation of head veins 
6.high hemoglobin 

How to treat this ?

1.panadol extra 3 times a day 
3.medrone forte 3 times a day 
4.sumatryptan for migrain 
5.calcium channel blocker as enalpril 
6.O2 mask 

What are the investigation ?

1.brain ct scan 
2.CT scan for sinuses and temporal bone 
3.CBC