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Your photo didn't go through, please try it again. Until then, you could seek advice from your local Master Gardener program. This article will help you connect: http://mastergardeners.org.uk/get-involved/find-your-nearest-master-gardener/

I'm suspecting a disease, since it seems to be moving through your plants, but this article discusses a number of things to be aware of, and possible treatments: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm

First step is to check your cultivation practices - problems most often are caused by improper watering, soil management, or fertilizing. Check the guidelines in this article: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm
After this, check for insects and disease. https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossoms-no-tomatoes.htm
You can also call the nearest botanical garden for information about contacting a master gardener group, who will help you with analysis and treatment.

There is a worm that would fit that description. The problem is, I am not certain that it lives in Australia. It is called a blackworm (go figure). It likes marshy areas and procreates by splitting its body. Here is more information: https://en.wikipedia.org/wiki/Lumbriculus_variegatus

It sounds like it may be leaf curl virus. Typically, you would also see yellowing with this virus, but it can happen without the yellowing. This article will have more information: http://www.ipm.ucdavis.edu/PMG/r783103311.html

This article should be of some help with that: https://www.gardeningknowhow.com/plant-problems/pests/insects/leaf-miner-control.htm