This could very well be a seroma. I had a TEP procedure done last wednesday and my surgeons were very helpful.
Seromas normally occur 3-5 days after the surgery. It's a fluid that builds up where the hernia used to be. This will take some weeks to subside. An ultrasound will tell immediately if it is the hernia again.
The swelling in the scrotum is normal aswell. Mine is huge at the moment, making me waddle.
These operations do take a long time to fully right themselves. It's more likely to be a seroma than a reoccurance, at least that's true of the UK hospitals. It will take weeks for the swelling and fluid build-up to subside and a couple of months before you are looking and feeling as you did before (minus a hernia or two).