Try not to worry about it. At the end of the day you listened to your instincts amd reduced the dose. And you were only giving it a couple times a day so im sure he will be fine.
I would definately try the lower dose at each feed during the day for a few days and see if you notice an improvement.
As the others have said it is only a temp fix. The bottle says max 14 days but my dr said it was ok for a bit longer to get the losec into him before stopping.
Good luck and dont be so hard on yourself. Reflux babies are hard work and we just do whatever we can to survive.
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