Yep I have. I remember how normal person should behave, what kind of ideas and inclinations they have usually, and what psychologists consider healthy. So yes I've sometimes become suspected I'm unhealthy.
The hard part is that I've gone to an advanced state of suspicion of some issue, but I've known that I'm not a clinician, and my knowledge of the diagnostic criteria might affect my judgement. I've a slight tendency to be hypochondriac, something that I know, but it's hard to take into account in every individual thing I think.
I know this from having often gone to see a doctor tho there's been no serious illness. I mean, things like head hurts, stomach hurts etc.
Another source of error comes from illnesses or conditions that are known to alter one's perception. I've tried to take into account those biases, like increased confidence while under the influence of alcohol. At least I believe being accurately (not overly) confident in my self even when drunk. Still, I have not been always able to discount the loss of confidence and happiness while depressed. It has just taken over me sometimes in the past, but then at least I've known to be depressed for sure.
So it's a tricky business. I think I've had a pretty good idea of any possible issues I might have had, tho not an overinflated list of problems. I might not have surprised at any professional diagnosis at any time, but it would have certainly been more accurate than anything I could have provided myself.
Understanding myself has been helpful in getting me over all the troubles I've had in my life. I don't think that it's the end of it, tho. It's what I decide to do to my problems. I do emotional planning and see how my desires and feelings will change should I follow some plan or the other, and then use it to make the correct choice. According to one psychologist, a person adept in emotional-analytical planning can do anything they ever set their mind to. That's pretty much what it feels like, too.
p.s. I think I had probably survived from my burnout and depression a year earlier had I been more of an active visitor to the psychologist's office. So, my trust in my own abilities was my downfall.