It's fucking hernia and nothing more. Your nut is receding back into your abdomen through the opening that shouldn't be there.
Your nut sack has filled up with interstitial fluid, so it should be soft and feel like it has water in it. You nuts are attached to the scrotum, so you have nothing to worry about, they won't get lost in your abdomen.
The only bad thing that can happen is that your small intestine could fall down into your scrotum and entangle with your nuts. As long as the hole that's causing all this doesn't close up, nothing bad can happen, you'll just have a bigger nutsack.
However, your scrotum could get itchy due to the fluid build up, leading you to scratch the base of your nuts excessively. This could dislodge and separate them from the scrotum, leading to some real problems.
I suggest you don't scratch your balls, I also suggest you don't lift heavy weights or exert yourself greatly, this will enlarge the hole and cause your entire crap factory to fall down into your scrotum.
There is a danger the hole could heal and close up, pinching any intestines that have managed to fall through, blocking your digestive system and causing infection and death, or even causing you to lose your nuts in the ensuing infection.
The chance of that happening is tiny, something like 0.1%, because when an open wound is covered in fluid, it will not heal.
Go to the doctor and get this fixed, it will take about 30 minutes and you'll be out of there in a day. Don't worry, you have plenty of time, I had a hernia for 4 years before I even started thinking about going to the doctor.
However once you get an abdominal hernia expect to get another after the operation, and another, and another, unless you start living like the queen of england, not having to lift anything heavier than a cup of tea. Shit happens.
