Quick update;
I started hGH and within 2 days I was getting the above symptoms, on the 3rd day I added an antihistamine (Loratadine) and the symptoms subsided dramatically within 24 hours.
After a few days of this I stopped the Loratadine and had no symptoms after a Friday night shot (4iu hGH), my next shot was the Monday evening and within 2 hours of taking it I started to get the itching feeling again so will now take the Loratadine regularly and monitor.
i also have the antihistamine cetirizine so will trial that shortly (I had planned to try both together but apparently this can lead to complications.)