Welcome to HW.
I take 5mg of Cialis daily (I cut the 20's with a pill cutter, and take a quarter a day). Yes, there is a mild lower back pain that goes with it for me. Also a little stuffiness, but I'm usually on antihistamines for other issues, so they balance out.
Overall body aches may also have to do with getting over the surgery in general. I was not up to much at all in the way of physical activity for a couple of months. Getting my exercise up a little helped.
But has the ache gone away? Not really, but it is minimal for me. I did have to stop the Cialis during my RT, as what is uncomfortable normally was a problem when I had to be absolutely immobile for 10 minutes.
I have not tried the other options. My uro/surgeon perfers Cialis and Levitra (I have a couple of samples of Levitra to try). Viagra is the other option.
I'm really just taking this for blood flow - in theory, since they took the nerves, I'll not have any grand results, but I'll keep a bit of hope in reserve.