What Causes Heavy Feeling In Left Leg Leading To Difficulty Walking?

my left leg is heavy and causing walking problems, lower back pain occasionally, numbness in right leg beginning to feel heat sensations in upper body with numbness. Seen the dr for trapped nerve in left shoulder, been taking nuproxen and given exercises, no pain now, still numb in both hands worst in left, had blood test and waiting for results. left hand fingers curling in sometimes hard to straighten... right hand is better seems relatively ok some stiffness . if walking up steps left leg misjudges height or takes effort to lift higher...feels hard to control. I am also a diabetic but results are good. Also high colesterol taking simvastatins but have stopped for a week but taking again now. Nurse struggled to take blood rom left arm last week and moved to right as ok. Any idea what s wrong with me? caroline x