pain relief without constipation

When is totally safe to use an enema and when is it not?
I have had constipation for about 3 weeks. Only go a little at a time, but soft when I do pass stool. Today, I know it’s constipation. I am desperate for relief. Not dying in pain, but uncomfortable. I know they say not to do enemas if there is an obstruction. How are you supposed to know that without going to the ER or GI doc? I am an OBGYN nurse, I deal with the other end. Any pros out there?
I’d use an enema now BEFORE you’re dying in pain. You can use a Fleet which will cause a lot of cramping but is effective or I’d recommend a large warm water enema. Two would be better.
Virtual Healer Show #3 Relieve Constipation And Pain