Is there such a fear or phobia of a fear of having nothing.losing everything material & ending up with nothing

I think you're just being paranoid. You should start thinking rationally and perhaps list down why and when these fears came about. If you notice a chain or pattern of behaviour that has not helped you to feel better about the environment or yourself, then consider changing these 'trend'. I hope you have someone to turn to to discuss these things as it really helps when you get an observer to pinpoint the 'mistakes' you've made.