Hi Sorry to hear about your IBS. I tried the fybogel and peppermint and they didn't work for me. See my post about Aloe Vera it may work for you because I had the same symptoms.
Along with getting enough fiber, are you making sure to drink a lot of water? If you are not drinking enough water, the increased fiber won't help you. You might want to talk to your doctor about starting on a mild laxative to help with the constipation which might also help the pain. My recommendation would be something like miralax or milk of magnesia.
Thank you for taking the time to reply, to be honest I don't drink alot of water but do drink alot of caffeine. Thank you again, I'm sure your comment will be most helpful.
I would recommend reducing your caffeine intake and try and drink at least 64 oz (8 glasses) of water a day.