I'm in a lot of pain for no apparent reason, back, sides, shoulders.?

It started about 2-3 weeks ago. The pain is from my waist up to my shoulders. I'm mid 40's but feel about 90 at the moment. It's worse in bed and in the mornings when I can hardly turn over. I have not been lifting or doing anything too strenuous. It almost feels like there's a huge weight inside me. Also very tired, but this could be because I can't sleep properly.