Hi,
I too am having serious problems with paraesthesia, tinging (pins and needles) and
pain - (However, in my case its in te left-leg and left side of my chest so far) I've had it for over a month now and its not improving (see my other post).
I did some research and these symptoms are generally caused by nerve problems, but there's a huge range of possible things that can be putting pressure on the nerves.
Worse case scenario, it's either the onset an auto-immune disease (most likely Multiple Sclerosis, if the symptoms are very general like they are for you and me), or there's a cancer tumor somewhere that's now grown large enough to hit a nerve. (Both these worst-cases are not terribly likely though, so don't panic yet!)
Best case scenario, its only temporary nerve inflammation that will go away of its own accord.
Try loading up with mega-does of the following for a couple of weeks and see if it helps:
Vitamin D
Vitamin B12
Omega-3 (Fatty Acids)
There is some evidence that these can reduce nerve inflammation and retard MS.