I'm "hearing" Binaural Beats

[Swagala]

I was placing my awareness on the top of my head then it started to feel like my head was opening up or expanding for a few minutes. After I felt like it couldn't expand anymore, I opened my eyes, and placed my awareness on the silence around me. Then, I began to notice these "wub wubbing" sounds inside my head. It's like I can hear them but I can also feel them around the back and the top of my head. The strange thing is, when I placed more focus and awareness on it, I started seeing flowery patterns on the curtains I was looking at. The patterns looked similar to the ones I would see when tripping on LSD but less intense. I saw then on my curtains, a little bit on my hands. I'm not sure if I tricked myself into seeing these patterns or not. This is the first time I've really noticed these sounds or whatever they are.

Anyone else experienced this before and know the significance in it?