Like Barb, it is a daily thing for me, just worse at times and on the left. I do not have abdominal reflexes on that side. They have been absent for a few years and I know won't be coming back. On a daily basis, I don't sit for too long as that irritates it.
The pain varies but during a flare I am flat on my back as just moving irritates it. Breathing is difficult as I am being squeezed and it is at those times that I call it the MS vise grip. Additionally, I at times have experience the feeling of a board being shoved in to my side, a burning ripping pain, and muscle spasms that can be seen. Truly, this is my most painful symptom and is constant to varying degrees.
To help with the pain, I use ice (which is good for nerve conduction) and put my arm above my head, which helps both the pain and with the breathing.
Sending you gentle, gentle cyber

's.
BTW - You can always tell where I am on my rib pain level by whether or not I have a bra on.

Sometimes bras seem to irritate it more and cause more banding.