My left arm is tingling and numb with what feels like a mild electrical current right down to my finger tips as well as a constant ache and small hard lump in my upper back, witch I think may be a knot pressing against a nerve?? also I get a lot of head rushes, now for prolonged periods, like dizzy, gaunt etc, I can stand for 5 minutes before my legs give out, I'm 44 fit for my age, male, and lately my diet is not so good in the veges dept.