There are a few things you can do to increase your success with tomatoes.
Don't plant in the same place two years in a row. This lessens the chance of disease.
Plant a number of different varieties. If one does poorly, another may pick up the slack. Different varieties will also ripen at different times so you'll have a steadier supply.
Support your tomatoes with a cage or by staking them. This keeps the fruit off the ground and helps the plant dry faster.
Do not sprinkle tomato plants; water the ground (i.e. the root zone).
This is the first time that I am paying attention to companion planting suggestions. Tomatoes can be planted with peppers, basil, parsley, and marigolds. They should NOT be planted near dill. Dill will pop up around the garden so remove it when it sprouts near the tomatoes.
Gardening is cheaper than therapy - and you get tomatoes! Author unknown