I am one of them. I can function perfectly in work, in life, in love. But deep inside, I'm... sad. I can't tell why I'm sad and anxious, but that's it. One problem with KL is the price for mental healthcare is expensive, and company medical cards don't usually cover them. I fully understand that like other healthcare, it come with cost for expertise, but sadly it's not available to general public...
Anyway I am finding counsellor that's affordable to move forward, for me and my family. I'm functional depressed but my family & gf seems to be the one suffering the most...
Also I don't know if government clinic would bother - It's not like I'm not functional... lol.
Yes, in depression you can be "functional" but like a zombie of sorts (I've been there myself).
I recommend Brain Mind Specialist Clinic Malaysia (this is not a paid promo or anything).
Money is one thing. But when you are treated suitably ie. mentally, physically, spiritually... and then you come out of the depression, you will feel like you were in some other place where there were only dark clouds. When you come "out" of that, you will then realise how important it was to get treated.
All the best.