I have chronic anxiety disorder and was diagnosed with hookworm infection in 2015. I took antibiotics but in excess. I often get severe headache and vomiting if my stomach doesn't get clean. I had done endoscopy, colonoscopy, X-ray, ultrasound, stool culture test but all reports were normal. My doc diagnosed me with chronic constipation and dysnergia after anorectal test and advised me to have biofeedback therapy. Even if taking fiber powder, my symptoms occur when i don't stool. I'm very fed up because i'm not to enjoy my life. Is having antibiotics in excess made gut microbiomes disturbance or is it due to weak pelvic floor muscles? Should i have SIBO test?