HI I have IC and MSK, (Medullary Sponge Kidney Disease) actually I have met quite a few people with both conditions. If you would like to pm me I would be glad to talk with you about the differences in the symptoms, since at first this was very confusing to me as well. Now I know enough to know which symptoms cause what etc.
We also have an MSK board on medhelp. If your not a member I would encourage you to come and join us, again there a several of us with both.
http://www.medhelp.org/forums/show/256
Shelly
Shelly Matthewson
Private Researcher
IC Support Group Leader
Director of MOARK Interstitial Cystitis