What dosage are you using? You are most likely using way too high of a dosage and/or not drinking enough water.
There is a lot of misinformation out there when it comes to creatine supplementation. There is no need to load or cycle creatine. Supplement with 5-10g per day. When you take the creatine doesn't matter but ideally you would supplement with creatine pre and post workout, as your body is most inclined to absorb nutrients at this time. Supplementing with creatine post workout will also help replenish depleted creatine phosphate stores from your workout. http://needtobuildmuscle.com/store/Pre-Post-Workout-Supps/Ancient-Strength-p273.html
Some companies have some lactose in their creatine, which can also cause bloating and stomachal discomfort. Try taking some digestive enzymes and pro-biotics. Also, it would be a good idea to consider switching the brand. Personally, I really like the Ancient Strength by N2BM - have been using it for like 2 years now, and never had any stomach related problems. Works great, and it has a great price - what else could one want from a creatine?