Which painkiller is best for recurrent pain?

You mention that you are already taking a pain killer, can you be more specific as to what medication you are being prescribed and for what ailment?
The more info you provide the more we can help as to guiding you in the right direction. There various options for chronic pain, again, please try to be specific.

I read you mention Neoplasia, please let us know which type:

https://www.drugs.com/condition/multiple-endocrine-adenomas.html