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Yeah, that's why I suggested checking the shifter end, where you can't normally see within the actual shifter. I've broken cables at that end and the cable is still gripped so it feels complete but the snapped bit is in the rotating shifter body so it doesn't move properly, in my case only did like half the number of clicks before it stopped/jammed. Finger's crossed. Cables are cheaper than shifters.
Can you pull the cable out of the shifter? ie. is the little shifter end cap still attached to the cable?
Cables can look like they're still connected but if they've snapped within the shifter it's hard to tell.