I had pretty severe pain the first couple of days--yes, even standing up was tough and sitting up from a lying down position was really hard. And I said the same thing you did--I felt like I'd been kicked by a horse. For me it went away pretty fast. The first two days were bad but I remember feeling OK sitting up and standing by the fourth day--it still hurt if I laughed or moved in other ways that used stomach muscles. By the second week I had no pain at all. Hang in there Hayley!