weird pain (literally) in the butt

[Guest guest]

I have been having this weird pain and cramp in my left butt cheek--

right above my thigh. Most of the day as I walk around I can feel it

sore, as if I had a muscle that was pulled but is almost healed.

Just tender etc........But not bad enough to make me walk funny or

anything. But at night when I get home, after I have sat for awhile,

it cramps BAD! I will get up, take a few steps and suddenly I can't

walk anymore. It hurts so bad that I have to grab the wall or my

husband. It makes me want to cry. So that happens all evening and

getting in and out of bed is hard as well. By morning I am fine.

Anyone know what this could be?