Hi Home,
Yes, of course many of us have been there. I would first start by challenging another belief you seem to be holding, that you will not be able to trust or believe in anything anymore. How can you be sure of that? Is this really true, or might it be another belief that will become obsolete along with the rest of the JW inspired stuff you used to hold?
Purpose is overrated, and emptiness is misunderstood, as far as I'm concerned. To me "purpose" is just another word for judgement, the way it is usually used, people tend to measure themselves against a goal or something they set out to do, and in the process they get so caught up that they forget it is just some other thing. (assuming they had that perspective at some point before that) The assumption that you have to have some definite purpose is itself a judgement, that if you have no purpose and goals in your life you're somehow worth less than other people. Sorry, but that's just bullshit.
This gets into emptiness. Most people have this idea that if you are empty you mean nothing, so that you are also worth nothing. Well, I will say that is only half true. The other part of that is that emptiness is pure potentiality, it is full of possibilities, whereas some smart ass who thinks they're hot stuff with their lofty life goals are simply locked into their assumptions about life and success in life. This doesn't mean people who have no goals are better than those who do, either, it just depends on what you think of them and the perspective you have. If someone really has a clue they'll know that it's just another thing in life, and that the most important thing is life itself.