Maybe something like a physical therapy regimen necessary to walk again? Going to the dentist for some painful procedure to prevent future difficulties?
Fair enough; however, those desires are still not based on empty desires which have no limits.
To my mind, this doctrine addresses desires that do not arise from genuine need but from empty values ingrained by social conditioning.
Exactly. It's important to make the distinction between unnecessary desires (which are part of pleasure seeking in Epicurus' philosophy) and the empty desire that have no limit. Note, I'm saying the desires have no limit. Pleasure itself always has a limit, ie, the absence of pain.
some desires which will take a lot of effort to obtain but also which will lead to great bodily or mental pain if they are not achieved.
This strikes me as well represented by sanantoniogarden 's examples. The desire to walk when this inability is due to injury is well founded.