I looked at curly leaf virus images before I posted and they didn't look the same to me. Here's one sample
https://vegetablemdonline.ppath.cornell. ... 41A_02.jpg
but reading the description, it still seems possible, but not entirely fitting:
Infected tomato plants initially show stunted and erect or upright plant growth; plants infected at an early stage of growth will show severe stunting. However, the most diagnostic symptoms are those in leaves.
Leaves of infected plants are small and curl upward; and show strong crumpling and interveinal and marginal yellowing. The internodes of infected plants become shortened and, together with the stunted growth, plants often take on a bushy appearance, which is sometimes referred to as 'bonsai' or broccoli'-like growth. Flowers formed on infected plants commonly do not develop and fall off (abscise). Fruit production is dramatically reduced, particularly when plants are infected at an early age, and it is not uncommon for losses of 100% to be experienced in fields with heavily infected plants
but one thing that doesn't seem to fit is "shortened internodes" "bushy appearance." Something else I looked at said thickened shoots. The pictures of your plant showed lengthened internodes with spindly shoots and whatever the opposite of bushy is.
So I would still be looking in to the herbicide possibility.