That is a very good point Elayne and something that needs to be considered, especially when writing an explanation of the point. In stating the four in most succinct form, however, I think it is important to stay a closely as possible to the wording of Epicurus or the most reliable texts, and the translations of that seem to all say "sensation." Now it might be relevant here to go back to what Don has been pointing out that perhaps "internal sensations" is better than feelings.
This is the kind of thing that needs to be thought through and perhaps should vary with the location where it is being used.
Actually as I type this I am now thinking that this is an issue which is not entirely clear, and we need to be careful. We need to consider whether what we today define as "feeling" what Epicurus was saying in the words translated as "pathe" or "passions" or "internal sensations" or feelings?" And I am not entirely sure whether Epicurus was equating sensations with feelings or not (probably not) nevertheless the way he is relating them may not be something we really have a final finger on.
I guess the place to start would be to examine that segment of the passage in PD2 to see exactly what word was used. Don or anyone, can you help with that?