Hey sounds like one of the burst disks on your reg has blown. Does your bottle regulator have to of these burst disks on it? If so you need to see what number the burst one has on it. That will tell you what burst disk you need to replace it. If you are not confident wourking on it yourself then don't risk it and if you do try anything please make sure the tank is completely empty beforehand. If you need someone else to do it for you i'd ask at your local site as they would likely be more than happy to help. If i've been unclear about any of this please feel free to ask