I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
Your tomato symptoms don't fit any disease very well. I suggest you try taking a sample to your County Extension office in case it start to happen again. See if they can identify the problem and if necessary prescribe an appropriate remedy. I might suggest trying a larger container as a 14 inch pot is minimal for a large tomato plant. When you water give it a good soaking and them let it dry out well.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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