Kindly advise the treatment for severe constipation.

Hi doctor,

I am 22 years old and severely constipated. I have a bowel movement once every week and a half, or even two weeks. I eat normal foods as any 22 year old would. I love fruits and drink lots of water, etc. I am on my fourth day of Miralax and nothing has happened. The only thing that has worked is when I got an enema in the ER.

My biggest issue right now is excessive gas. I am a student. When I get nervous before a presentation in class, just being in class in general, I get excessive gas and it is so bad that it makes terrible noises and sends me running from the classroom. Then when I get out of the classroom, it is as if it goes away. So my anxiety before presentations I believe makes it worse, therefore my doctor prescribed Xanax .25 mg as needed before those events. However, I know that my constipation is contributing to this. I am in desperate need of a solution. My doctor wants me to get a colonoscopy. What foods and what can I take to help with my constipation and decrease gas during class so that I can focus and earn my degree.