You may have regurgitated a little bit of acid that backed up from your stomach, during your sleep. This would cause you to lose your breath and wake you up. If you have an acid reflux problem, then you can take an acid reducer, such as prilosec, which you can purchase over the counter. At this time, use the inhaler as it was prescribed. Although, it can be a scary feeling, I think it was an isolated incident. Sleep with your head propped up on 2 pillows. Reduce intake of fried or spicy foods and don't eat for at least 2 hours befor going to bed.