I m a male 21 years old 5 10 200lbs I just recently had lower back surgery for herniated disk on july 29th and now everytime I stand up I have extreme pain in my left sometimes a 10 on a pain scale from 1 to 10. I went to the ER and they didnt do much just took my blood,vitals and the reg. I asked if it could be a blood clot and they said they didnt really know but did not think so.I m going today to get tested for a blood clot. What do you think is wrong with me?