Ok, I was doing some research on shingles and I came across the following on dermnetnz.org (keep reading to the end if you haven't had shingles - it is not the only cause):
Post-herpetic neuralgia is defined as persistence or recurrence of pain more than a month after the onset of shingles. It becomes increasingly common with age affecting about a third of patients over 40 and is particularly likely if there is facial infection. The pain may be continuous and burning with increased sensitivity in the affected areas, or a spasmodic shooting type, or, rarely, of an itchy, crawling variety. The overlying skin is numb or exquisitely sensitive to touch. Sometimes, instead of pain, the neuralgia results in a persistent itch (neuropathic pruritus).
and the going to "neuropathic pruritus":
Pruritus and itch are synonymous terms. Pruritus is defined as an unpleasant sensation on the skin that provokes the desire to rub or scratch the area to obtain relief. Pruritus can cause discomfort and frustration; in severe cases it can lead to disturbed sleep, anxiety and depression. Constant scratching to obtain relief can damage the skin (excoriation, lichenification) and reduce its effectiveness as a major protective barrier.
and then to "Notalgia Paraesthetica" (One issue causing BACK itching or the medical term - Pruritus):
Notalgia paraesthetica is a condition where itch and/or changed sensation arise in the areas of skin just below the shoulder blade on either side of the back.
Visible changes arise from rubbing and scratching the affected area. These include hyperpigmentation (brown mark), hypopigmentation (white mark),lichen simplex (a type of eczema) and scarring. There may be changed sensation when this is tested for with pinprick, cotton wool or heat and cold.
Cause of notalgia paraesthetica
The nerves which supply sensation to the upper back emerge from the spinal cord (2nd to 6th thoracic segments) and run a long course up through the thick muscles of the back. They make a right-angled turn before reaching the skin. The nerves appear to be vulnerable to damage. This may be a minor injury, herpes zoster (shingles) or even sunburn. The result is itch and sometimes altered sensations.
Treatment of notalgia paraesthetica
Treatment is not always successful. Effective measures may include the following:
Cooling lotions as required (camphor and menthol)Capsaicin cream - this depletes nerve endings of their chemical transmittersLocal anaesthetic creamsAmitriptyline tablets at nightTranscutaneous electrical nerve stimulation (TENS)GabapentinBotulinum toxinPhototherapy
So, this is what I have found out so far. It really clicked with my issue, I hope this helps others, at least give you a name to go see your family Doctor(s).