Cherry tomatoes

My 2 cherry tomato plants are still suffering from blossom drop! I am clueless on how to help them. I will just leave them alone la... since I am clueless! LOL... the leaves are turning a bit yellowish.. wondering if it is due to lack of some minerals... I read that epsom salt can help to bring about some green-ness in the leaves of the plants.. will try to get some epsom salt and try on them to see if it will help to promote leaves growth...