I agree with the other. I hope you make the appointment today. I used to get those stabbing pains and it was down to poor blood circulation. My feet had swollen up because i was not walking or exercising and the blood just accumulated in my foot because it was not circulating round my body but once i started doing a bit of exercise after a couple of days, it was fine. I would go to see your G.P.
I hope your mood is a bit better today.