On Shabbat morning I was leining torah1 when, not long into an aliyah, I started having temporary but ill-timed vision problems that made it difficult to read. As a result I made many mistakes (despite being well-practiced) that had to be corrected, which was embarrassing to me and probably not very pleasant for the kehal. I wondered whether I should abort but was not sure (a) whether that was appropriate or inappropriate or (b) if appropriate, how to implement it correctly. I strongly suspected that stopping mid-aliyah to ask for guidance would be a problem.
I have a question pending with my rabbi for the local ruling, but I am wondering what the general halacha is if something impedes a ba'al koreh during the reading. If he absolutely can't continue then, well, he can't, but what about a case like mine, where it was technically possible to continue (it's not like I fainted or something) but in a very problematic way?
1 For purposes of this question can we please grant that this was a setting where a woman reading torah is ok? I'd rather not get sidetracked by that, and considered asking the question in the third person to obscure that detail. However, I thought it was more important to be able to answer any questions that come up about the nature of the impairment, should that matter.