Time to blow the colon?

I've been constipated for two weeks. The only thing that has worked (slightly), is a biscy enema. Then it was back to stopped up. Last three days miralax: 1 cap, then 1.5, and 1.5. Nothing. I think it's time for the colon blow - the rest of the bottle and Gatorade. Problem is, I feel like the problem is higher up. It feels like it's my guts that are backed up, not the colon. The enema cleaned out a bit, but I did not feel too much "less full" after. Is constipation of the small intestine a thing? That's what it feels like. I need to get this shit out..