Hi Summer,
Don't be scared as this can be easily fixed.....I'm surprised that you've waited this long without seeking treatment! This is very common in older pets & it seems the Winter makes it worse.....As with Humans, dogs get aches & pains....What your describing sounds like Arthritis.
Please get this girl to a Vet so he/she can prescribe prescription Anti-inflammatories! She needs some relief as she sounds as if she is very uncomfortable....Your Dr. will work with you on what will relieve your dog's pain, best. There are many pain control medications that work great! You Vet needs to determine whats best for your dog...
Dogs can live comfortably for years with medication...Please, don't wait! It sounds as if everyone could use a good nights sleep. ;) Karla
Your dog needs to be seen by a vet, he will give her Rymadyl or some type of pain meds for arthritis, which should help a lot. I would block the stairs so she can't try to get up unless your there, and carry her up at night. They are a big problem. As far as the peeing in her sleep, the vet can check her for an UTI or give her hormone replacement drugs, possibly. Good Luck.