You maybe somehow pinching the nerves up and down your arm causing Paresthesia . If it doesn’t go away and continues non stop you might have Chronic Paresthesia . But, that’s for a Dr. to decide.

It can be related to Tegretol if that’s the drug yo take ask physio

I have had 2 frozen shoulder it can be drug related I went to Osteopath but ended up having it manipulated under aesthetic pleased to say after some physio & hydro back to normal again

Sometimes I get an ache in my arm and it was the way I was resting my arm or lying on it I get pins and needles in my hands and feet when it’s in my feet I like to stamp the floor or go to some cold flooring to try and get some feeling back I shake my wrists to get rid of the pins and needles and I do some exercise on my arm it’s different when it’s on your thigh my left thigh went numb for a few weeks it took time to come back to normal I think it was the way I was lying that’s me though talk to your consultant until then try some exercises on your arm x x

I always get the pins and needles sensation on my right side b4 l have a seizure it starts at my head and moves downwoods, yours could just be in your arm instead we all work differently..