Suggest Treatment For Regulating The Bowel Movements

Hello... I would like to know the best way to come off having to use laxatives every 2-4 days in order to have a bowel movement. Approximately 9 yrs ago I had surgery on my jaw and had issues with constipation for several months. I have been too nervous to not take a laxative every 2-4 days for fear of getting an obstruction. I have a very sensitive stomach.... raw vegetables and fruit, along with high fiber cause me to have severe intestinal cramping... What can I do to regulate by bowel habits and how long is it ok to go without stooling?