Foot pain - between metatarsals

[Deleted User]

Hi all - apologies this has to be my first post rather than something about training!

I've got pain in my foot, right between my first and second metatarsals. It doesn't hurt to press on either of the bones itself (although the second meta is a bit tender), but if I press inbetween them (about half way up my foot), I get a quite deep, dull-feeling pain which radiates underneath to the bottom of the foot.

It seemed to come up during parkrun on Saturday - I was wearing my flats but it was quite muddy and boggy in parts, which I wasn't expecting.. Then I had to cut short my long run yesterday at 8 miles - it wasn't excruciating, but enough to make the call to stop. Before then, no problem. 

Anybody had a similar problem? I'm hoping I just tied my laces too tight for the race on Saturday and I've inflamed something rather than anything more sinister.