Hi starfruit, enemas are nothing to dread, especially when you are not constipated as you are almost surely not at this point during your fast. But you are likely not eliminating all the low volume toxic residue that fasting promotes.
Enemas under these circumstances are easy. I actually look forward to my enema each day while I'm fasting.
Here are some links and a position to take the enema in that many people find especially comfortable: