Oh mate, I can feel the pain from here lol.
Take some painkillers/anti-inflammatories to ease any pain and swelling. I think the swelling is normal, it's just the same as suffering trauma to any other part of the body or any other organ, you're bound to experience some swelling/bruising. But just keep an eye on it and if the swelling hasn't reduce in 24hrs perhaps a trip to the gp to make sure nothing is seriously wrong would advisable.
You might even be able to ice the region, just don't apply ice directly to the testicle without something covering the testicle, like a towel of thick cloth.
Btw, i'm not a doctor, this is just my opinion.