I'm having some troubles with my breathing and I'm feeling really worried. It's like I can't take a deep breath properly and my brain feels like it's not functioning properly. I've been feeling constantly tired and my head feels pressured, almost like the oxygen isn't reaching my brain even though I'm breathing normally. It's a consistent issue that just doesn't go away. Could there be something wrong with how the oxygen is getting to my brain? I'm really looking for some guidance on this. Please help me understand what's going on.