HELP PLEASE: Romeo & Juliet Poetic devices

Hey to all.

I've never posted before so I hope this works.
I'm doing an assigment about poetry and I know that Shakespear always uses poetic devices and had a rhythm in his plays, so I settled on the speech romeo says in act 5 scene 3 just before he drinks the poison. Anyway, I know this is not a sonnet and has no rhyming in it, but I have found heaps of imagery, figurative, personifications etc.

Anyway I have a few questions.
Besides the obvious personification, metaphors, imagery, etc are their any other poetic devices used in this part?
What's Poetic diction using eloquent words and phrases? Is this present in this speech?
What exactly is an iambic pentameter rhythm?
Figurative devices, are they similat to metaphors and similies??
Allusions, what are they exactly and are they present in this section?
is Situational Irony any different from normal irony?

thank you soooo much for you time, I really appreciate it.