What is different between feelings and emotions? In which way it would be better to use "my feelings" or "my emotions"? In my opinion emotions is something temporary and quickly disappear. But feelings is much more deeply inside us and some where near by our soul. And what should we do when our emotions overfill us?

How should I use word "Could"? What are the common ways for this? When I'm answering... When I'm asking about smth... and