Tobacco Mosaic Virus On Tomato

It appears that your tomato plant has Virus. There are 3 virus possibility. WE have included links below. Two of the viruses are spread by aphids (sounds like the insect that you described). A third, the Tobacco Mosaic Virus, is very easily transmitted when an infected leaf rubs against a leaf of a healthy plant, by contaminated tools, and occasionally by workers whose hands become contaminated with TMV after smoking cigarettes. The “mosaic” appearance of the yellow/green tissues of the leaf, and what appears to be a “shoe-string” or ferny look is a characteristic symptom of a virus disease. Unfortunately viruses cannot be reversed or cured, however infected plants may produce edible fruit, but yield, size, and quality are reduced. Here are a few links that you might find helpful:
http://www.ipm.ucdavis.edu/PMG/r783102811.html
http://www.ipm.ucdavis.edu/PMG/r783102611.html
http://www.ipm.ucdavis.edu/PMG/r783102711.html