sounds like time for taking suckers and cutting from the heirloom tomatoes, planted in a bucket in the house with potting mix and time release fertilizer.
(potting mix to by pass soil diseases that stress and finally kill the plant and infect tomatoes)
Get a small to medium artist or makeup brush to hand pollinate, the plant will grow, produce slower, but instead of the plant charging you a govermnent issue $75.00 / tomato - price, make the live part of the plant earn it's keep - and through the winter - (under a bright floor lamp - already in use in the eveings), produce homegrown tomatoes, red for sandwiches and green for fried green tomatoes.