It lasts for less than a minute but it can come and go very regularly, it's been happening most of the day for the past week or so.
No vision problems, I have seen a slight muscle 'spasm' in my leg, it looks like the muscle in my calf was contracting slightly, like a twitchy eyelid sensatio, but no tremors or weakness.
Yes, mainly my lower back injury was causing tingling down my buttocks and legs so I went to check I hadn't damaged nerves. I then went back again because there was discomfort in my lower abdomen too and I thought I might have pulled a hernia with it.
I do have a high level of health anxiety so always worrying about health issues, but the sensations feel real, although I try not to go too often.