So I was snooping around on line, trying to find out how often lime/calcium should be applied (I did make another application about a week ago) and found other options since lime will definitely change the pH of your soil to perhaps too alkaline.
This is a good all-purpose info page for tomatoes that recommends gypsum (which apparently won't change your soil pH) as an amendment.
This site recommends lime as only a quick, temporary fix and recommends dolomite or gypsum as a more permanent solution to soil imbalance problems.
I suppose the smart thing would be to get a soil test kit and test the pH of my potting soil, but I don't have the spare money right now. If you're using a potting mix straight out of the bag it should list the pH on the sack. I do add a lot of peat to my soil for water retention and to make it lighter and peat is very acidic. I see gypsum and/or dolomite in my future gardening endeavors.
Ah, the trials and tribulations of tending the soil! You plant, you grow, you learn.