Thank you so much for your reply to all of you :)
Sciatic nerve, sacroiliac joint, or deep vein thrombosis come to mind, but the latter would be more likely in the leg. Call your doc just to be sure.
I've been having the same issue. I first changed the shoes I was wearing which helped for about a month. Now sitting for any peorid of time on a hard surface makes me wanna SCREAM when I get up. Oh Lord trying to walk is almost impossible.
I had the same problem and it was due to my sacroiliac (SI) joint. I found stretching, light exercise, and heating pads helped. Prolonged sitting made mine worse. Probably lasted 2 months before it resolved for me. Not dangerous just *****