Sharp pain in groin today

Hi,

I've been at my computer for almost all the day, but every time I did
something that involved standing up, I've had a sharp pain (feeling of
razor inside me) that hits me a fraction of second that goes but comes
back now and then if I continue to move.

I had an inguinal Hernia repair where the pain is something like 2
years ago, but I never had any problem since the operation. I had it
repaired at the Shouldice hernia repair center in Toronto.

Also, I'm very active an train 3-4 times a week and I also do some
running and swimming (I'm training for a marathon but I hurt my knee
so I'm swimming between the time I recover).

Now, the only thing unusual is that I did some oblique workout
yesterday and I rarely do, most of the time I constrain myself to
front abs exercises. I wonder if I might have pulled a muscle or
derange something where the hernia was.

If someone as an idea what it is, I would be really thankful.
.