Can anyone here share personal positive and/or negative experience using cymbalta?

I have been prescribed cymbalta for help with my overwhelming generalized anxiety. Doc says it can take 3-4 weeks to kick in. He promised it will not cause weight gain . That's all the info I have on it so far. I'd love to hear personal experiences.

He has prescribed lorazepam (ativan) as that is much faster-acting than cymbalta. Said to take the ativan until the cymbalta kicks in.