Jellybean tomato plant not producing

I have a jellybean tomato plant that I grew from Ferry Morse seeds. I have just one plant. It's about 3.5 feet tall and supported by a wire cage. The others didn't survive. They are rather difficult to grow from seed. It looks green and healthy. It has a decent number of little yellow flowers and has been flowering for more than a month I think. But it has not one tomato. Also, some of the flowers just fall off by themselves. They break off the stem easily. I've been watering it every day and I gave it fertilizer a couple of times. I also used a little sulfur a couple of times since this is in southern California and the soil is alkaline. Do you think maybe the high heat has prevented tomatoes from forming? Do I need more than one plant to polinate? I have another tomato plant with regular size tomatoes and it has produced a lot of tomaoes.
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