I think the problem with the pepper flowers falling off is that they're not getting pollinated. Tomato plants can be self pollinating if they get moved around by the wind, or lightly shaken, like I do in the greenhouse, but I'm not so sure about the peppers.
I think the desert soil is fairly devoid of nutrients, so you should probably give them a little bit of all purpose fertilizer. You should be able to get organic fertilizer if you don't want to use something like miracle grow.
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Ah, I didn't consider how peppers might be pollinated. I had assumed they were self-pollinating like the tomatoes. Hmm... Maybe I'll try to help them out a little.
I had sprinkled something onto the soil called Osmocote, Flower & Vegetable fertilizer. I've been wondering if I put too much fertilizer in there? And I planted a little black bean plant in the same pot as the pepper. I've heard that beans can add nitrogen to the soil, so maybe it was too much nitrogen? I've also wondered if the recent increased use of the air conditioner has negatively affected the pepper plant? I'm not sure. I'll have to experiment some more.
Thank you for your comments!