Even eating a small amount of food causing constipation and indigestion. Kindly help.

Chronic nausea, constipation, indegestion, and a burning sensation whenever i eat anything of food size, which is really discouraging. I do deal with major anxiety, and I am on zoloft, and welbutrin. I am underaged, and generally dont go outside often. I dont normally eat healthy but i do constantly drink water. Any help would be very appreciated!! Im so confused as to whats wrong with my body, this has been going on for about 5 months, after i got the stomach flu i was never the same.

I have this problem for 5 months after eating even a small meal. Before 5 months, after eating I got the stomach bug and had a traumatic experience. From there, I began to have nausea, it became worse and worse over the time what it is now.