@chris_k, You need to follow up with your urologist when he/she gets back into the office ASAP.
My guess is you have a hematoma, but you really need to get a physical examination by a urologist to figure this out.
I suppose it could be an infection, but that would be worse case scenario IMO.
I’m not thinking you have a varicocele all of a sudden, but idk.
Far as draining, cutting, etc, let’s figure out what this is before you get yourself all worked up about any of that.
Keep us posted.