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Answer: It is Rabbinically prohibited to have medical treatment (refuah) on Shabbat (Shabbat 111a; Shulchan Aruch, Orach Chayim 328:1) out of concern that this may lead him to violate Shabbat, e.g., by grinding herbs. However, just as there are dispensations for one who is truly sick, even if it is not life threatening (choleh she’ein bo sakana =csebs) to have things done that are usually forbidden on Shabbat (see Shulchan Aruch, Orach Chayim 328:17), so too the prohibition of refuah is waived (Rama ad loc. 37; see Orchot Shabbat 20:(149)).
There is also leniency in the other direction. Sometimes a health-minded action is not considered medicinal, either because there is no "halachic malady" or because the action is not similar enough to the prohibition. (Details/distinctions are complex – see Shulchan Aruch, OC 328 and Shemirat Shabbat K’hilchata 34.) However, nose drops/spray for nasal issues are halachically medicinal (Shemirat Shabbat K’hilchata 34:10).

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One can raise grounds for leniency. The goal was not to solve a problem of allergies but to rule out a concern for Corona and allow normalcy. In contrast, the logic of issur refuah is that one whose mind is focused on healing his malady may forget to not avoid violating Shabbat in the process (see Rif, Shabbat 24b; Eglei Tal, Tochen 16). Rav M. Feinstein (Igrot Moshe, Yoreh Deah IV, 13) allowed a "healthy asthmatic" to take medicine to prevent an attack while exerting himself walking to shul, because he was not suffering when he took the medicine, so it is dissimilar to the classic concern. This could apply to our case as well. However, while my main motivation was for something external, I also would have used the spray, during the week, to alleviate the likely allergies.
A better justification is to facilitate mitzva/ot (minyan, kri’at hatorah, guests – discussion of which need is a sufficient mitzva is beyond our scope). The Minchat Yitzchak (I:108) argues, in a parallel case, that since mitzvot are grounds to allow asking a non-Jew to violate a Rabbinic prohibition (Shulchan Aruch, OC 307:5), they can justify taking medicines (based on Radbaz III:640).
The Orchot Shabbat (20:(197)) strengthens this approach with the Magen Avraham’s statement (338:1) that whatever is permitted for a csebs is permitted for a mitzva. He is slightly hesitant, perhaps primarily out of concern for a slippery slope (e.g., people will say "I cannot learn or enjoy my meal properly the way I feel"). I would distinguish between defined mitzvot one will miss and between enhancing mitzvot. Chazal were well aware that people with a meichush enjoy everything less, and still their concern about chillul Shabbat caused them to prohibit medicine. Similar concerns made them cancel the mitzvot of shofar and lulav!
Some claim that issur refuah is anachronistic, as people do not prepare their own medicines nowadays. The main refutation is that we do not undo Rabbinic laws even if their basis changes (Rambam, Mamrim 2:2). Actually, the claim is anachronistic - nowadays many people prepare home-made remedies (Google search "herbal remedies" – 141 mil. results).
I did use the medicine.

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