Fever, nausea, headache, dizziness, vomiting, constipation. Cause?

Infectious. It is hard to know the exact cause but with these symptoms an infectious cause should be considered and ruled out as you may need treatment. Please seek evaluation by your primary care physician.

Related Questions

Ok if I have had a headache for 6 days and neck pain (feels kinda like muscle tightness) and dizziness, is there any way this is meningitis? No fever. No vomiting, slight nausea.

CervicogenicHeadache. The most common symptoms of meningitis are fever and vomiting. The pain of cervicogenic headache is usually unilateral; it originates in the neck and then spreads to the oculofrontal-temporal areas of the head. Read more...
Doubtful. Headache and neck pain are symptoms of meningitis but usually there is associated fever and pronounced sense of illness. 6 days is a long time for a headache and perhaps muscle contraction due to stress and anxiety is the type of headache you're having.Mild viral meningitis is unlikely. I recommend having an examination by your physician for diagnosis and treatment as it'll set your mind at ease. Read more...
Comments: Why are you concerned about meningitis? Have you had contact with a person with meningitis? Your headache could be due to multiple other causes, such as migraine, problems due to neck, jaw, dentition, sinuses. Did you contact your regular physician yet? At least, reassure yourself. Read more...