At the beach and I felt hot but was not sweating and I'm sitting under an umbrella. I got up to go…

At the beach and I felt hot but was not sweating and I'm sitting under an umbrella. I got up to go in the water to cool off and I started to come out and I felt horrible pain in my vagina and hips when walking and it continued to hurt when I say down. Didn't have this pain with my first.....is it common?