Apart from poetry, are you obsessed with anything? Ask yourself the questions:

What are you obsessed about?

Why are you obsessed about that thing in particular?

What extreme actions will you take to sate an obsession?

What do those close to you think of it?

What are their own little foibles in this area?

Set yourself a timer of ten minutes and just write about your obsessions, this may take list form or be coherent paragraphs. Just go with the flow.

Once the ten minutes are up, read the list out. Is there an over all theme within the writing or an innate structure? Use this list as the structure to build your poem on.