Hi Aladin,
That's an excellent question. Being able to talk normally to friends, family and work colleagues without brain fog is a huge benefit. But milnacipran does help with my depression and anxiety too. After all, it is classified in some countries as an anti-depressant.
I currently take it "on demand", so the effects have usually gone within 24 hours. If you were to take it every day as an anti-depressant under medical supervision, my guess is that it could help with any depression/anxiety issues that you may have in addition to getting rid of the brain fog. But you would need to speak to a doctor to get a proper opinion about that