Duloxetine

I have been on Pregaberline for about 18 months and it has been helpful with the muscle pain , the side effects where hard to get use to at first ,mainly dizziness ,tiredness, and weight gain from sugar craving, but the reduction in pain was the pay off.
However i read an article that sited a study showing that it stopped the production of new synapses in the brain , so with concern i spoke with my specialist who said that if i had concerns we could try Duloxetine,
I am currently on a withdrawal program till we switch drugs ,I was just wondering if any one had been on this drug and what the benefits and downside (if any) there where.
I have LGMD Myofibrillar myopathy, I am still mobile but am at the point that a scooter or similar aid would greatly improve my life as well as my families, however pain management seems to be my no 1 focus at the moment, so any thoughts or experiences would very helpful at the moment.