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It sounds like an infection there bacteria Protozoa parasites. Could be combined .
From my limited knowledge if yellow stool definitively problems with gallbladder liver. I'm not saying you are having these but giardia and hpilory usually makes stool looks like that. These are the most common infections.
Could also have other parasites.
If infections are chronic or massive and you have impaired liver function there is a good chance that you'll have probls with tyroid and adrenals. Senzitivity to temperature.
Maybe should try to test and help more with the diet and detox as jill said first until you figure out what's going on. The symptoms could be common for many pathogens. Anxiety and Depression could both produced by several chronic infection by affecting the adrenals and by toxins. I have had these symptoms plus yellow stool in chronic stage of giardia pillory candida. The symptoms reduced when the load reduced.