Possible problems with Pets

In the fight for relief from depression and anxiety I question everybody I think might have knowledge of things that are in my life. Like could my pet be causing some of this depression. This is before I came into the thought that allergies could be playing a part of the problem.  My vet said that some people have problems as listed below. I put it here for future reference
Toxoplasma
Bartonella
And to take antibody tests