I Am Experiencing Currently Muscle Pain/weakness/stiffness In My Legs. It

I am experiencing currently muscle pain/weakness/stiffness in my legs. It is worse in the evening. I could barely get off the couch after watching one tv show last night. I have been very thirsty. If I am not still it doesn't get so bad - otherwise the pain/stiffness is hard to overcome. This seems to be something that comes and goes and this is the latest symptoms. I have over the last several months experienced muscle pain and weakness in my arms and legs along with tingling and numbness. I'm avg size, a bit overweight, non-athletic, but generally healthy 41 year old.