Definitely sounds like you have milk. The VOOM sensation is actually engorgement, which not everyone gets, but it can appear at any time when you have more milk than baby is drinking.

I'd say relax, it sounds like your body is working to perfection! As for me, I had sweats, leaking and my boobs went from a size C to a size E!!!!!!! Ouch! I had to use cold washers to ease the pain.

I know its hard, but don't worry...if your baby is happy and has wet nappies etc, its sounds like everything is perfect. Well done!