I definitely agree with the above, find out why he is colicy. Where I used to work we had a stallion that was colicy for 3 days, the stud manager kept on giving him a muscle relaxant to help relieve the pain and it worked kind of but he never got better.
On the third day he laid down and couldn't get up, so he was put to sleep.
After an blood analysis was done we found out that he had had massive renal failure. He was 22.
We may not have been able to prevent it, but we could have helped sooner if we'd known. Please call your vet today.