This is getting silly

So I have shingles. Again. The last time was at the start of February, and this current influx (an influx of shingles...) marks the fourth time in a year. All previous times it's been brought on by stress and feeling run down. This time, I wasn't stressed, and I wasn't run down. Or at least I didn't think I was. So I have no idea why it's come out. I noticed it for what it was yesterday, but the docs was closed as it was Sunday. So this morning I made the call, and collected the pills this lunch time.