Feels like it’s impossible to be in my own head?

I get these anxiety waves where it feels I can’t cope I feel separated detached from myself like everything is too much or that my head will some how explode? My head warps into universe thoughts and it seems hard to imagine me. Like it seems life is much greater like I can think but not inside my head? It’s hard to describe is this a feeling of depersonalisation? Is this normal with anxiety? Why do I feel this way?