Wow, that sucks and is pretty unusual. Might you be immunocompromised? The CDC recommends the shingles vaccine for those over 19 who are immunocompromised, especially since those folks are more likely to get shingles multiple times. I'm thinking 1-2 days of flu-like symptoms from the vaccine is worth preventing multiple weeks of pretty serious pain - I would think your doc would strongly recommend that.
As I'm sure you found out, the antivirals can lessen the pain and rashes from shingles (in some cases, not all). About 9 years ago, I noticed a very small discoloration on my cheek and knowing that might be shingles (from talking to my mom who had it badly a few times), I saw my dermatologist within an hour of discovering it and she put me on Valtrex (valocyclivir) immediately and the rash never got any worse and I had no pain, luckily. Shingrix had just come out around then, so I got it soon after that episode. I had flu-like symptoms for about 24-36 hours, which kept me at home for a day (a Saturday, so I didn't miss work).
https://www.cdc.gov/shingles/hcp/vaccine-considerations/index.html