This is exactly the situation where a general physician needs to look at the whole picture rather than organ by organ. With normal MRI and normal colonoscopy, the commonest unifying explanations are IBS with autonomic overactivity, post-infective or post-surgery gut sensitivity,
thyroid problems, anaemia or a low-grade inflammatory/rheumatological process. Anxiety-related autonomic symptoms also genuinely cause dizziness and loose motions together, and that is not 'all in the head' - it is a real body response.
Next Steps
Please get CBC, ESR,
CRP,
TSH,
HbA1c,
vitamin D, RA factor and
thyroid antibodies, plus stool routine and, if not done, a coeliac screen (tTG-IgA). Also check BP lying down and after standing - a drop explains the dizziness. The right next specialist is a general/internal medicine physician who can put all reports together; rheumatology only if inflammatory markers or RA factor are abnormal. I am happy to review everything in one sitting - teleconsult (fee Rs 500) or at Synergy Multispeciality Hospital, Miraj.