Thank you for the concern; I seriously appreciate it.
Don't worry, it's nothing dangerous - just some pain.
See, for a long time now I've been rather a mess psychologically speaking. Among other issues, I often experience physical tension strong enough to cause quite a bit of pain if allowed to persist for long enough. (Neck region, primarily.) Given time, it can get bad enough to hurt for days. If I can't counteract it in time, that's not an uncommon result. (So that sucks. A lot.)
Taking long walks in daylight helps me unwind and, among other benefits, mitigate these issues. (Ultimately, as much as they suck, they're merely symptoms.) When days get shorter and/or there's more rain/cold/wind, getting enough of this type of relief becomes much more difficult. As such, increased pain isn't uncommon for me around this time of year. (And that's just the physical part.) Fortunately, at least it's usually been pretty warm of late, so despite the shorter days and occasional rain it hasn't been too bad compared to some past years - just kinda painful, is all.