For the last few months I have been having episodes that last around 1-2 days where I get intense pain in the left side of my back (around where the small of my back is - so lower back?) and the left side of my abdomen (slightly lower than my belly button), and intense nausea. It's severe enough that I have to get into bed/stop work and can't do much. It's a constant gnawing pain. It's hard to describe.
It seems to happen around once a month, often around a week before my period. I'm 28 and have regular cycles. It's always on the left side. The nausea lingers for another day or so after the pain eases. It feels different to period pain though as the back pain is a lot higher up than my usual lower back period pain is.
Each time it happens I think about calling 111 but then end up putting it off, and then by the next day it's gone just as suddenly as it appeared so I forget about it until the next time.
Does anyone have any ideas?