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Regarding your question

What is the treatment for severe headache?

1.Drinking plenty of fluids
2.Avoid xanthines like coffee and tea
3.Massage your neck 
4.Acetaminophen like panadol 
5.Ibuprofen like advil
6.Migraine medication like naproxen
7.Voltaren injection
8.Perscribed Medication like tramal

What are the causes for severe headache?

1.Dehydration
2.visual problems
3.Ear diseases
4.High blood pressure
5.Neck spasms
6.Sinusitis and inflammations
7.Sleep disorder
8.Teeth problems 
9.Hemorrhage

What are the investigations for severe headache?

1.Clinical assessment at the nearest medical center
2.Blood analysis
3.Eye exam
4.Head imaging MRI and CT
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