I've had to reduce my dosage of LDN pretty far now, I was starting to experience some weird side effects described by others as "emotional flatness", I'm actually now down to an "ultra low dose" of 0.20 ml and it seems to be working better.
The dehydration has reduced as well as the perceived anhedonia, I'm back to being able to get straight out of bed upon waking as opposed to feeling dizzy, exhausted, with an unpleasant sensation of feeling very dehydrated all over, ranging from my eyes to my muscles.
For me it isn't surprising as I seem to be very sensitive to medication, it may also well be the formulation of the LDN I'm taking, but it felt as if the opioid blocking effects persisted a very long time at higher doses at times when I should be experiencing the "bounce back" endorphin recovery phase.
I also wouldn't use probiotics while using LDN, I think any sort of excess of bacteria is no good if you're using it, good or bad.
I use caprylic acid, black seed oil, oil of oregano and a bulking agent to clear my GI tract every now and again.
Of course I don't use all three at once all the time, but at intervals based on how my guts are performing.
Also try laying off the sugars and give it another go, possibly start a 0.50 for a few weeks and see what happens.