Hi Shaylls, you may have some fluid building up in that area where you had auxiliary node clearance.
Mine felt quite weird too and as @Afraser said, it does feel like an "out of body experience" for a while.
I found my experience to be like a "burning sensation" in my armpit initially which was accumulated fluid - just something to look out for & a chat with a breast care nurse or the hospital may ease any concerns. May also need draining.
With regards to the numbness, that may last a while, unfortunately but nowhere near as uncomfortable as the first week or two.