Constipation problem..!!

Hey,
I’m 21 years old. Since my childhood, I have had chronic constipation. Later I was diagnosed with ulcerative proctitis. So I used to take laxatives specifically colace products. My constipation used to respond to these colace laxative products. But as I get older, it’s getting more and more difficult. I tried to do exercise and diet, but that doesn’t make any difference. Moreover, my gastroenterologist told me that I have a long, tortuous colon, and that’s the reason why it’s difficult for matter to get through it. And the worst part is there is no known cause or treatment for this. So I’m totally depressed. I’ve looked on the internet and found nothing about this problem. I don’t know what to do. I’m in trouble!