I'm terrified whenever somebody covers my mouth with their hand. I feel like I can't breathe even though I can still breathe out of my nose. Sometimes me and my older brother wrestle and tackle each other for fun, but when he puts his hand over my mouth I go crazy. I start screaming and hypervenalating. It's so weird though, because I feel like I'm going to die from oxygen loss. Can somebody please tell me if this is normal??