Never tried it but 87 mil S is a lot of S and combining that with 17mg of C, I'm not surprised that you experienced "stuffed up my sinuses".
I've posted before that I used to get stuffy nose when I took 40mg S and used a nasal decongestant spray to offset that effect. The stuffy nose was particularly troublesome (if no nasal spray used) and annoying when I was lying on my stomach getting a massage — so bad I could only breathe thru my mouth.
As I 've gotten older I now require a higher dosage of S for same anti-ED effect (now 75mg). I still get a slight headache but interesting enough no longer get the stuffy nose.
BTW, I usually take S on an empty stomach but if I've had some food I will let the S dissolve under my tongue. Two things: unpleasant taste and the effects are quicker (15 min after it disintegrates) than swallowing the S whole. It's worth fasting for a couple of hours to avoid the under the tongue routine.
Years ago when I first tried S I took your advice and bought Afrin for the occasion.
But this time it didn't help. The sinus pain was intense and lasted into the next day.
I've settled on using generic C because it fits my needs better (four hour sessions and overnights vs a quick half hour massage and fuck). And I get no side effects at all from 20 mil of C. None. Whereas when I did try V a few years ago I'd get a running nose a few hours later.
From what I'm reading about the products that are specifically made to dissolve under the tongue it seems they are making it taste good.
To be clear, I wasn't using the product that was 87/17, just quoting the ad. Was using my own concoction which was part of the problem.