Agnes-need your advice,severe stomache problems

I have suffered with severe abnormal constipation for the past two years.I say abnormal because my stool is like nothing I've ever seen before,like flat pieces of hard woodlike substance.Colonoscopy and barium enema shows no reason for my problem.Dr. diagnosed me with IBS.Prescribed bentyl,it only added to the problem.I found this site in my search for information.I simply don't digest my food and feel my health becoming worse every day.I have done the Liver Flush four times over the past two months.I read somewhere that yogurt with active cultures was good for constipation.I started eating lowfat yogurt three times a day between meals and before bedtime.I couldn't believe that it actually softend my stool.I missed one day of eating yogurt friday,when I did my last cleanse.After taking the Epsom Salt I couldn't go to the bathroom.The only thing I passed before taking the oil mixture was a small piece of wood like stuff,I did the cleanse anyway and had the usual diahrea the next day.Didn't feel as well as the last time.Even tho the yogurt softens my stool I have a hard time passing it,have to strain and can't empty my colon.feel the need to go all the time.My stomache cramps and feels miserable all the time.Feel nauseaus and don't have normal appetite.I feel that I am missing something in my digestive system and don't know what to do.I hope I have explained my problem well enough for you to understand.I really need your advice.I have an apt.with G.I. dr. the twenty second of this month but so far they have't been much help.
Even tho I don't post messages I visit everyday and get alot out of reading the post from everyone else.I hope you can offer some suggestion for my problem.

Thanks,Alice Tweet