I've been struggling massively for the past couple of years with depression and anxiety caused by coming to terms with childhood emotional abuse. I see a therapist and have done for the past 4 years, I have a very supportive DP and friends. I was on ADs for 6 months, since I came off them I have been managing quite well with a healthy diet, lots of sleep, exercise and just generally working hard at taking care of myself.
At work, my line manager knows my situation as I have had some time off, just a couple of days on a couple of occasions. I have told 2 close colleagues but haven't told anyone else at work.
My new healthy lifestyle has meant a fairly significant weight loss which means I have had a lot of wildly enthusiastic comments about how much weight I have lost. I absolutely hate this because the weight loss comes from a very sad and painful place. I know that the person congratulating me doesn't know this but I still find it really hard. When people ask me how I've done it, I usually respond with 'well I've been unwell actually', which doesn't make a jot of difference to their enthusiasm 
I'm wondering if it's easier just to say 'well I've been suffering from depression actually and I'm controlling it through exercise and diet so hence the weightloss'. I guess I'm wondering if it's time to 'come out of the closet' as it were!
Please share your reasons why you did/didn't share your mental health issues with people you don't know that well and how it worked out for you. Thanks all