Mental health and physical health can be likened to one another in a myriad of ways, but ultimately although they are somewhat similar, there's one clear difference: with the majority of physical health concerns, there are a number of tests that can give you an answer as to what's going on. You go to the doctors with a problem, and you expect them to (eventually) be able to say, okay, you have X illness, and here's what we can do. I'm not saying this happens with all physical health conditions, or that things always get diagnosed correctly at first all the time. For mental health issues however, there are no blood tests or urine samples or anything that can really tell you if you have a problem.
Looking back on times when my mental health was at its worst, all I can think of as an answer to this is 'yes'. But in reality, it's a no.