Bulgarian to English Medical Other Medical questionnaire

I'm doing a back translation of a questionnaire that was originally written in English, and I would like the opinion of native Bulgarian speakers about whether these lines are reasonably colloquial. For pain, at least, I usually see descriptors like "най-силна" or "най-тежка." This is the first time I've seen "максималната болка" or "максималната сухота."

Максималната сухота, която можеш да си представиш.

Максималната болка, която можеш да си представиш