What Is The Cause For Having Weakness In Legs, Pins And Needles Sensations And Occassional Spiking Pains At Random Lcations?

I have been taking HTC since 97 and after starting I needed Advair and Abuterol and jump forward I now struggle to do a mile on the exercycle and 1 lap in the pool I can still get 25 X2 pushups and 50 X2 situps but legs are week and I have a lot of trouble with long (4 or more hours) periods of activity, pins and needles commons at random locations, occasional spiking pain at random locations, dizziness, confusion. My salt intake is very low and is hardly ever added at the table or when I cook.