Back and Bum

I've really hurt my back, maybe from working in the garden. I felt it when I did a run on Monday but today it's much worse. It's my lower back that hurts and it goes all the way down to my bum (!?).

I can't do this right now

It's so annoying, it might mean that I will have to take a break from running as I don't want to injure myself further. Luckily the masseuse is coming to work today so I will ask her to have a look at it.