Can internal bleeding heal itself?

My
friend and I were wrestling a last week end, just messing around, nothing to
rough. Then out of no where he grabs my shoulders and knees me in the solerplex
as hard as he god given could. I went down to my knees and couldn’t breathe for
a good 30 seconds before I could even start taking little gasps off air… The
next day, I was watching a show about fighting styles, and one part showed and
explaining how a hard knee to the solerplex can cause collapsed lunges, organ
tares, and even mild to massive internal bleeding. I didn’t feel any pain in the
area after words, nor did the skin look any different, and being that I don’t
have medical insurance, I can not see a doctor to determine if I do have
internal bleeding or any other injures; we simply don’t have the money. I just
want to know if I have a reason to be worrying like I am or not.

~Ooh, don’t worry I got him back this past weekend… =P
Since this happened last weekend, and you have absolutely no symptoms of
collapsed lungs, torn organs, or internal bleeding, you have no reason to be
worrying. If you had any of those things, you would know by now and you would be
in a hospital.
You're fine. If you had a collapsed lung, you would be fighting for air, your
chest would be making sucking noises, and you'd probably turn blue.
Internal bleeding usually causes low blood pressure, so you'd feel faint
dizzy.