Fibromyalgia or Spinal stenosis

Hi,

I have been complaining of pains in my legs for a few years now maybe longer. I remember having physiotherapy for  shoulder pain I had. Then was asked if I felt better and said no. So she said maybe it's your spine. The doctors always said to me it's the lack of vitamin d.
But I work in retail and the pain in my legs hot and my arms hurt my right side is bad. My current doctor said I have muscle weakness on that side.
I feel much worse now because I become extremely tired each day like I have not slept. Pain in legs and arms worse. 
My hand just hurts and I do have the odd times I get a bit of energy but just try carrying on. Right arm swollen. 
My doctor thinks I could have fibromyalgia after said I am struggling tired all the time.
My memory has got so bad with things and I do sometimes lay in bed a lot.
I did try do excercises but felt sick so stopped. I did try pushing myself to do excercises.
I can't sit high on a chair feel my fingers feeling funny as I type. Tingling, pin and needle.
I just would appreciate if someone could advise on both conditions please.