The pain you're getting sounds like a sciatica? I've had one for 3 years and it started with pain in my foot during spinning classes until it got really bad one day all along my leg and hip. The problem comes from my lower back, the nerve gets pinched. I am fine cycling on my commute I don't use clips (I only ride SS) but whenever I use spinning bikes at the gym I can feel it.
So yes get it checked out and also do some stretching exercises for your back. There are some excellent very simple yoga exercises to help with sciatica check the web, (but be careful some yoga exercises will make it worse).
The pain you're getting sounds like a sciatica? I've had one for 3 years and it started with pain in my foot during spinning classes until it got really bad one day all along my leg and hip. The problem comes from my lower back, the nerve gets pinched. I am fine cycling on my commute I don't use clips (I only ride SS) but whenever I use spinning bikes at the gym I can feel it.
So yes get it checked out and also do some stretching exercises for your back. There are some excellent very simple yoga exercises to help with sciatica check the web, (but be careful some yoga exercises will make it worse).