Hello and welcome, Stella.I was paid. Thanks for all you have been doing. I am so sorry about your severe headache. Shingles can present without a rash occasionally. The shingles virus is same as the chicken pox virus. It stays in the body without causing any symptoms and in the 6th or 7th decade of life may cause Shingles. The other possibilities of diagnosis in your case can be;1) Occipital neuralgia2) Nervus intermedius neuralgia3) Trigeminal neuralgia4) Giant cell arteritis (GCA), also known as temporal arteritis or cranial arteritis 5) Migraine6) Cluster headacheMedications like carbamazepine, pregabalin, gabapentin may help. MRI, I hope must have been done, which is essential to rule our / diagnose the various issues. Following work up, if not yet done would also be advised;1) visual field testing; 2) erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) 3) MRI with Gadolinium contrast4) Magnetic resonance angiography (MRA).
Chronic daily headache is not a type of headache but frequent headaches of various kinds. Most people with chronic daily headache have migraine or tension-type headache as the underlying type of headache. Tension headaches are the most common type of primary headache. So probably this also would be considered in the differential diagnosis of your headache. A tension headache is a headache caused by tense muscles in the face, neck, or scalp. These headaches give a feeling of tightness around the head. The neck muscles can also become sore and tight. Tension headaches can be caused by staying in one position for a long time, such as reading, playing video games or using a computer.
Migraine headaches are the second most common type of primary headache. Cluster headaches are a rare type primary headache. There are other causes of headache also;
1) sinus headache
2) Medication overuse headache
3) Post trauma headache; occur after injury or accident.
4) Secondary headache
It is a great privilege assisting you. You have been very caring about everything. I am very fortunate to know you and Andy.Dr. Arun