Hi Robi,
Welcome to healthcare magic!
Such
headaches are a challenge to diagnose.
I would suggest an ENT reference and thorough examination and investigation.
A
sinusitis can easily diagnosed by Xray-PNS and a Local physical examination.
If that is the case then treatment apart from antibiotics would also be needed.
Another possibility is an eye problem, The vision problems -
refraction errors are to be ruled out,
glaucoma can also be there. You need to consult an ophthalmologist also.
If you have associated fever/ vomiting/ early morning worsening of headache the a CT Scan brain and
Sinuses is recommended.
You need a physical examination by your physician and get base line investigations like Chest and PNS X Ray, Complete Blood Counts, Renal Function Tests.
This work up is expected to detect the underlying problem so a definite treatment could be started.
I hope this advise would be helpful for you.
Still if you have any queries or doubts, please write me back,
I would be happy to solve them.
Wish you a great health!