Pain In Feet, Hips, Wrists, Knees. Test For Rheumatoid Arthritis Was Clear, Osteoarthritis Levels Rising. Polymyalgia Rheumatica?

HI, Almost overnight at the beginning of this year, the tops of my feet became so sore that I had to walk with a limp or not at all. I have had difficulty for over 18 months with not being able to lift my arms above my shoulders, and I have had pain in my hips and arms and wrists and knees that wakes me at night. The pain is worse in the morning and also gets worse when I sit or lay down for more than about 20 mins. The pain is mostly on both sides at the same time, and comes without warning. Some days I have pain in my feet and nowhere else, while the next day that pain has gone only to have appeared in another area, say my hips or arms. I have had tests for Rheumatoid Arthritis which were clear, and tests also showed I had osteo arthritis levels rising. I am almost 50 years old, and I have been advised to follow up the possibility of my symptoms as indicating Polymyalgia Rheumatica. Does this sound like what it could be and what is the treatment. Thanks, Rosetta