I do energy work with animals, specializing in dogs and horses. As of now, I am a Level 3 Healing Touch for Animals practitioner. Now, this is considered Holistic Healthcare. One of the first and foremost things we are taught in these classes, is always ALWAYS defer to vets for anything like this.
Colic can go from bad to worse VERY quickly, and while holistic medicines are great, I 100% recommend having your vet know exactly what is going on and getting his/her opinion first and foremost.
Now, back to holistic medication. We learn a lot about using Essential Oils to help with things like this. Let me restate, we do NOT use these alone, nor do we claim to be an alternative method to a vet. Holistic medicines are meant to be used in conjunction with traditional medicine. If you can find a Holistic animal doctor in your area, I'd suggest asking them about using these oils as a supplement.
There are also energy-work techniques that can help with colic. Feel free to PM me if you have any further questions.