I suffer from depression & anxiety and have been diagnosed with Emotionally Unstable Personality Disorder (EUPD - also called Borderline Personality disorder). Who else finds that saying "I'm okay" or "I'm just tired" is the stock answer to when anyone asks "Are you feeling okay?". In my head I have an explanation, a proper answer, even a request for help but I just can't say it. There have been times when talking with someone I have started to open up but then find that they have "black cat syndrome" so I allow the negative filters to kick in and go quiet. I also have the problem whereby my OH also has health issues but he will literally moan about everything so I feel either a) my problem is insignificant or b) why bother because he is feeling so sorry for himself it is wrong of me to ask for a bit of compassion or support.
The biggest problem is, though, I am like this with my GP. I see her every month and sitting waiting in the waiting room I know what I want to say but in the end say nothing.