Hi, I too have ET. The symptoms you describe are almost exactly the same as I have gone through. The rib pain, as my Dr explained is due to very minute blockages in the small vessels that are in our bones. He assured me that they would not escape the ribs, and if they did, no harm would come. I am on 1000-1500mg Hydroxyurea, 325mg aspirin, Iron and vitamin C suppliments. The rib pain has subsided but I occasionally have problems with my toes, feet, and fingers. I guess there is not much relief for that. Be sure you have properly fitting shoes (my Dr reccomended "Diabetic" type socks). For pain I'm on Ibuprofin 180mg daily. It works fairly well. This disease is rare so some doctors don't have a lot of experience with it; reseach it yourself and learn as much as possible on your own, also go to the website www.MPD.org for information.
I am still trying to get used to the lifestyle changes so please pass on any info possible.