My symptoms are not subjective. I lost weight, had constipation, was passing undigested food matter, had rashes all over my body, etc. But doctors still refused

My symptoms are not subjective. I lost weight, had constipation, was passing undigested food matter, had rashes all over my body, etc. But doctors still refused to investigate and told me nothing was wrong other than "yeah, you have some mild inflammation, don't eat food that bothers you".