Chronic chronic constipation and gas everyday

I need some help!  I do NOT know what else do do.  This past year, I've experienced chronic constipation and terrible gas every single day.  I have seen a gastrologist and nothing helps.  I have tried everything to have a bowel movement to no avail. My chronic gas starts about 3pm everyday and last through the night.  Nothing helps that either.
I have tried avoiding certain foods but I could eat an apple and get gas.  Please help!

Thank you,
Suzi

[mammo]

It could be IBS.  But for it to occur at the same time each day leads me to believe it's something you're eating.  Make sure you aren't eating foods that contain sorbitol or malitol, these are artificial sweeteners which cause this type of intestinal problems. There are OTC medications that can break up gas in the intestine, or your doctor can prescribe something.