What a dreadful dream, what does it mean?

I had the most horrible dream last night. I was feeling sick and eventually threw up: a black pod, a bit like a mermaid purse (egg sack) came out it slowly unfurled with lots of layers of black seaweed, eventually in the centre was a large striped crustacean like a lobster with wavy feelers, also inside were three brightly coloured "other" creatures but much smaller and they were desperately trying to inhabit the other people in the room. It was ghastly and makes feel quite odd. I hadn't eaten anything odd, nor taken mind alterating substances. But it quite put the creeps on me. Ughhh - any interpretations, or any one else had a similar dream?