tillydog,
Well, you do have degenerative changes in your spine which could account for your morning stiffness and pain. The fact that it is worse in the morning and gets a little better with activity, is a classic hallmark for inflammation. This is usually treated with some type of antiinflammatory medication (NSAIDs, steroid, oral, injected, etc)
The pins and needles in the legs, if they are in a particular dermatome, that correlates with the nerve root being pressed upon, then that may be the beginning of a radiculopathy. A radiculopathy can cause numbness and tingling, pain, weakness, etc in the area supplied by a particular nerve root.
This has to be determined with a physical exam, to see if the area of symptoms is the same as the area supplied by that nerve.
So, you do have changes in the spine that could be causing your symptoms. Most are degenerative in nature, but, as to whether or not they will get worse, is hard to tell. They most likely will not get better on their own, but there are treatments for them.
So, make a list of questions you want your surgeon to answer. Because, he/she is the one who will have access to your studies and physical exam, and will be in the best position to answer those questions and discuss your treatment options.
Good luck.