Some people find gabapentinoids to block the effects of opiates... and some don't. Sounds like for you, it does.
As far as kratom being dirty feeling, I actually agree, if you consume the leaf matter. But back in 2003, before kratom caught on and was virtually unheard of except where it's from, I used to buy crushed leaf and the only method of consumption I found in my research was the traditional method. So I did that. I would dose much higher and not consume the leaf at all, and the effects were amazing (also I was an opiate virgin so that had something to do with it). What I would do is take 10-16 grams (depending on tolerance), and simmer hem on low heat in water for 20 minutes. Strain it out, pour the dark liquid into a big jar or something, then do a second 20 minute extraction (too high a boil and it would burn). Combine them, and let cool until it turns into the color and consistency of creamed coffee. Throw away the leaves. I would drink it quickly and within minutes a stimulant comeup not unlike good cocaine would hit me, I would get super ecstatic and jump around and chatter to everyone about absolutely anything. Then an hour or so in, it would shift gears to a sedating opiate high. I rarely experienced the dizzy/dirty feeling using this method. Once I started using powdered leaf and consuming the leaf, I would dose quite a bit lower and I started noticing the weird dirty effects far more often.
My early kratom experiences were my favorite of any opiate experiences of my life, and I was addicted to various ones. After a time though I was never able to get those beautiful initial effects, even using the same method. Though I did try the traditional method again some years after beginning to toss and wash the powder and it still felt a lot cleaner and required a higher dose, but had better effects.
