To be honest, it doesn't really matter whether it's juice made from concentrate, or freshly squeezed. Fruit contains a lot of vitamins but it's also very, very high in sugar and most people don't realise your body doesn't distinguish between 'added' sugar or 'natural' sugar - as far as your body is concerned, it's all sugar.
Juice is particularly problematic as it is very high calorie - the single quickest way to put calories into your body is to drink a litre of juice, and it's made extra problematic by the fact that much of the sugar in fruit juice is fructose, which your body has a very strong preference for converting to fat for storage. Juice also raises your blood sugar very quickly which is why a glass of fruit juice is recommended as a hypo treatment.
As for you're going to do now....well, that depends. What impact does a small glass of fruit juice have on your blood sugar? If it's not significant, there's no real problem incorporating it into your diet. But a better option would be to eat whole fruit - whole fruit contains fibre which slows down the rate at which the sugar gets into your blood and can help with portion control. But it's safe to say, no-one, diabetes or not, can healthily eat substantial portions of fruit or drink juice without applying a bit of moderation.
Otherwise, you could look at no-added-sugar cranberry juice - cranberries are naturally very low in sugar and so their juice (if it's sweetened by an artificial sweetener) is probably the lowest sugar juice you can get. Although again, you probably don't want to drink loads of cranberry juice for urinary comfort reasons!
The idea that fruit juice and smoothies are healthy is one of the biggest lies that's been inflicted on the public in the last 20 years. I worry how many people must have joined a gym, done a load of exercise and then rewarded themselves with a massive smoothie, convinced they're doing everything right and then found they actually gain weight as a result of their 'healthy' lifestyle.