I've got 5 healthy-looking plants and have only had about 5 tomatoes total all summer. I feed them miracle-grow bloombuilder.
I lucked out this year with my tomatoes. I purchased an earth box and with 2 tomato plants, I've had massive yield. One of the prime ingredients is dolomite and using fertilizer that is not time release. I still have new flowers blooming and more tomatoes growing. I also used potting mix and not potting soil with fertilizer. Inconsistent watering, too much nitrogen fertilizer or not enough sunlight (less than 8 to 10 hours) could be the cause. Since I don't know your zone, I don't know what your temperatures are like but once daytime temperatures reach into the 90's and nighttime temperatures hover near the mid 70's, tomato plants have trouble setting fruit because high temperatures render the pollen sterile. I've listed the site for the earth box below if you're interested. I found it to be goof proof. This was the first time I'd ever tried to grow tomatoes and have I ever been pleased. It was so easy. I'd done all my research and didn't even need it!
Tomatoes don't need a lot of fertilizer. It sounds like you have overfed yours.You should put the fertilizer in at the bottom of the plants,and then no more.I would grow some more if you can.They need a good soak of water,then let dry out,before watering again.
Stop feeding them! Only feed them when they are actively fruiting, and even then only weekly.
