Just remember one principle: there are only two possibilities for' hast' in English poetry, one is a well-known fixed usage like hast, and the other is to omit a single letter because of spelling and then replace it with an apostrophe. If you are interested in English poetry, I suggest that you often read Shakespeare's poems, which is very common.
For example:
Meditation = meditation
4.o'erarches=overarches
Eternity is eternity. Ever- is a prefix, meaning forever, such as ever-lastingforever.
The first question, self, is a fixed usage.
For example, losing self-control is nervousness and rudeness.
Hurt one's self-esteem.
I really don't know the second question, sorry.