Not necessarily a big DXM story, but I have found myself using around 30mg of DMX a day in the form of nightime cold pills (15mg DMX HBr, 6.25mg Doxylamine Succinate, 325mg Acetaminophen per pill X 2 pills daily) for last 2 yrs give or take a few months. Not sure what it is about those little bastards since I really don't get any buzz or trip off of such a low dose. Although it does help me relieve stress extremely well & serves as a sleeping aid also. I definitely get how this crap can become pretty psychologically addictive.
Although personally I do not base my eating schedule around it & only take one dose daily after work (around 4 to 5pm). The more posts your like your I see the more I think I need to cut it out of my drug usage TBH. I also take 3mg of Suboxone daily, smoke roughly a pack & a quarter of cigarettes daily, smoke around 2 grams of pot daily, & take 1 to 1.5mg of Xanax 3 to 4 times per month so anything removal or reduction of the substances I take should surely help some. Very tough to do while I am feeling fine & have yet to be affected negatively by my usage of those things. Though I definitely do realize it's only a matter of time before my behavior bites me in the ass.
Sorry to hear to hear that your DXM usage is affecting your health, but I will say I doubt you have caused any permanent damage to your kidneys. Also you are definitely doing the right thing by getting kidney function test & blood work. I think maybe a taper might help with your journey to drop DXM completely since you have reported back that you are still using despite trying not too. Maybe reduce your dosage by 25 to 50mg a day till you get down to a point where you find yourself craving after the latest dosage drop. Then start dropping by smaller increments & possibly putting more time in between dosage drops.
The other thing I was curious about is when you say robogels, do you mean gel pills that contain only DXM, or are you using the same type as me which contains acetaminophen &/or Doxylamine Succinate? The amounts of those 2 substances you are intaking to get to 750 to 900mg of DXM daily would concern me far more as far as kidney damage is concerned than the DXM itself. Anyways be safe & I wish you the best on trying to drop DXM for good!