Feels like I am not living in the moment, sleep won't help, eating won't help.
What should I do? Feels like those memories are on a repeat and I just wanna escape and be with her right away.
I heard that the feeling of grief is healthy, unless it pushes you into depression (self loathing, despair, no more energy...) in which case you might need psychiatric help. I would say that wanting to die is quite a bad sign... Anyway, psychological help can always be good, I don't think it is good to dwell on it alone for a long time if it is that painful.
From my experience, strong but healthy grief lasts for some weeks only, short waves of sadness for a couple of months, then the waves have more space, and after a year, after the first anniversary, life really goes on with occasional memories coming back, reminding you of how much you love the person. Only time did it for me. I wish you a lot of courage, keep posting if you need to.