How long does it take for constipation to turn into an obstruction?

I'm going on 3 weeks with very little BMs. When I go, they are like small rocks or seems too thick. (sorry for gross visual). I've tried enemas, stool softeners, more liquids, and more fiber. Nothing has helped. I feel very bloated and my stomach looks a little distended. I've had very bad nausea but didn't throw up. I won't let myself. My stomach and left side of abdomen has an uncomfortable type burning feeling. Not like heartburn. It's constant. It's hard to get the stool to come out. Feels like I'm not finished after only a little bit and can't go more. A month ago I had my appendix removed and they found my intestines were stuck to my abdominal wall by adhesions. They fixed that. Could it be possible that more adhesions have formed and causing problems? How could they know? I'm not taking any narcotics. Just 2 Ibuprofen a day. I really don't want to see a doc about this. Kinda embarrassing subject. Could it be obstruction or partial obstruction? What should I do?