I'm going to go out on a limb here and suggest that your diet is a big part of things. Fermented veggies have lower fiber contents, and you need fiber to keep things moving. I do not understand why you are eating raw poultry, but contracting e. coli is not an advisable way to end your constipation.
Is the constipation issue chronic or episodic? When you have 'tummy pain' do you ride it out or do you visit the bathroom? Do you get stomach pains just as often when you are not constipated as when you are? Have you spoken with your doctor about all of this? These are important questions to ask, and no one (especially not on the internet) will be able to identify what's happening without knowing these things.
Also consider the following:
According to the University of
Maryland’s December 19, 2007 online
article by Stephen D. Ehrlich, N.M.D.
entitled “Constipation,” certain
medical conditions place some older
adults at risk for constipation,
including, but not limited to: bowel
diseases, such as irritable bowel
thyroid problems, such as
hypothyroidism mental health
conditions, such as depression
neurological conditions, such as
stroke certain cancers, such as colon
Some medications place seniors at risk
for constipation and the above article
by Dr. Ehrlich lists several
categories, such as: pain medications
anticonvulsants antacids tricyclic
diuretics or water pills
And keep in mind that you are 66 years old. Bowels do slow down with time, so stools will get dryer/harder to pass. That's an age issue, not a gut flora problem. Have you tried the classic prune route?