lower back pain, constipation, gas and weight gain

I'm sorry to hear of your problems, but I also had been suffering similarly for many many years. Doctors were of little or no help and the medication I was given I discovered would lead me to an earlier grave. A year later I am still undoing years of damage to my digestive tract, but the good news is that I successfully took myself off health damaging medications, and remain off them.

It is not easy to explain how I came to take this path to cure myself, except that no doctor was able to help and although not visibly ill, i constantly felt ill, with a long list of ailments and life was miserable.

I began looking at acid reflux, which led me to food combining and then on to the digestive tract and how it works and how the rest of the body and the mind rely on it working as it should.
An excellent source of information when starting out was the website 'the doctor within'
http://thedoctorwithin.com/index_fr.php?page=articles/journey_colon.php.
Naturally everyone is different and I would in no way suggest that anyone ignores medical advice but when all else fails one occasionally has to seek the answer elsewhere.
Good luck and I wish you well.