I Am 51 Yrs Old And Experiencing Leg, Calve, Foot

I am 51 yrs old and experiencing leg, calve, foot and arm cramps daily. I feel dehydrated although I drink water excessively. I make many trips to the bathroom maybe six or seven times a day and night. I have occasional blurred vision and dry mouth nothing taste like anything anymore. I try to drink or eat and sometimes I feel a burning sensation in my throat. What is going on with me?