Yes it could be all of these things but have you ever considered Alice in Wonderland Syndrome? It really sounds a lot like it. Typical symptoms include:

-Distorted time perception; time moving quickly or slowly.
-Distorted touch perception, e.g. a feeling that the ground is 'spongy' under the feet or that the sensation received from touching something is simply incorrect or unrecognized.
-Distorted sound perception.

If you believe you may have it I suggest going to the doctors.
I have it and what you are describing used to happen to me all the time when walking to school..
I really hope you find out what happened!