Hi,
Noted your history of cough for 2 weeks, like sinus problems, now
neck pain at back going to head,
motion sickness,
vomiting and son.
It seems from your history that your have muscle spasm in neck muscles causing pinched nerves that in turn cause headache at the back side.
This can be severe enough to cause nausea, vomiting, giddiness and so on.
Hene I would advise you the following:
First of all take care of neck pain by getting examined by your Doctor, MRI of neck if needed and further management as per the findings.
Now for the coughing and sinus like symptoms:
Consult an ENT for proper clinical evaluation, ENT
endoscopy examination, necessary investigations to get a cause and get treated accordingly.
Severe coughing can increase your neck and head problems.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T Chandrakant, ENT & General Surgeon