I Have Had Itching & Pin Pricks For A While

I have had itching & pin pricks for a while now on my arms legs & back, burning sensation & itching on my head. I have tried different body washes with glycerin. Putting on Jergens wet lotion. Some days I itch. It's like every 2 days, then maybe a day of not itching. Changed my blood pressure medicine. I'm itching & pin pricks tonight. I don't know what else to do.