1. I think it means it feels like everyone is chasing after you- either they want something from you (work or favors or money or ?) or you have done something bad and they want to bring you in for punishment. Either way the 'frozen ice floes' I take to mean that your footing (whether literal or figurative) is not very secure, so you may not be able to 'get away'. Some more context would be needed to confirm that guess.
2. It's a sarcastic take on an old saying derived from a Bible quote: "Cast your bread upon the waters..." You can search that bit to find many versions and explanations of its meaning.
The original encourages everyone to be kind to all and eventually that kindness will come back and you will benefit in ways you cannot foresee. This version says that if you are kind to a stranger, it might just as likely slap you in the face or simply go nowhere at all.
- For Teachers