I purchased this heinz Roma tomato container plant from HD about 5 or so weeks ago. It seemed to be doing fine for a while and now it appears sickly. The dark green and healthy leaves are now a much h lighter green and turning yellow. Many of the blossoms have appeared to wither. The first fruit has turned from green to brown.

My tablet captures awful photos but hopefully an expert here will have enough information to suggest what I need to do.