Just keep your eye on the light at the end of the tunnel. Your beautiful baby will be here in 2 months!! My son is 8 weeks old, and I also had a miserable last 2 months and was so ready to have the baby! I had trouble sleeping, my back and sciatic nerve was killing me. I also had some pre term labor issues and braxton hicks contractions for weeks before I went into labor.
While your waiting, make sure to do things during the day to distract yourself. Take a walk (when it's cooler in the morning). Take a warm (not hot) bath to help ease the back pain. If there is a pool you can go to or use, the water really helps the back pain! With my first pregnancy I lived in our subdivision pool!
Read some books, go to the library (I did that a lot with my first pregnancy too!) Once the baby comes you won't have time to relax much for a while so take advantage of that while you can.
Also get a manicure and pedicure, now is the time to pamper yourself.
Last if you can afford it a pre natal massage works wonders for your circulation and back pain. It helped my swelling ankles a lot! If you need a recommendation for a good massage therapist let me know, mine was amazing!