Dear Muttley.. I have gone through your post in which you have mentioned about your experience with cabbage diet.
The high fiber content in the cabbage diet is notorious for causing bloating
and gas, which is further causing you the symptoms of chest pressure, neck and back pain
But there is nothing to worry, as these symptoms are temporary & subsides with time.
There is no need of using enema
..Tablet Gas-X will be helpful.
If the symptoms still persist, then it will be better to consult a Gastroenterologist
Wishing you a good health.
Thanks & Take care.