I am sorry you find yourself in such a difficult position. Speaking from a personal experience, renal arterial stenosis can be reversed with an anti-inflammatory supplement regimen. I did it on my own without anybody's help or advice. I researched inflammation, read a couple of books and decided I'd never stick to either of the two diets, which had been shown in clinical trials to reverse inflammation. I then turned to supplements and natural anti-inflammatory products. The doctors could not believe the change several months later. Subsequent testing showed that the stenosis was completely gone. I hope it does not return. It has not cured my hypertension, or reversed the damage to the kidneys.
I have severe hypertension, which is also drug resistant. I understand perfectly what you've been going through. I've been on 5 bp drugs from different classes of antihypertensives since my diagnosis in December of last year. When I was given a very high dose of the potassium-robbing Hctz for my peripheral edema in August, (caused by my calcium channel blocker) I achieved a perfect blood pressure control for the first time ever. So low actually, I was really sick for about a week until my body got used to it.
I was also on another diuretic at the time, a potassium-sparing one, which helped to somewhat offset the potassium loss. If you could safely increase your dose of Hctz, without risking an electrolyte imbalance, your blood pressure would DROP. Mine did, like magic. I am on five drugs for blood pressure, two of which are diuretics, and a few others for other things. My blood pressure is not perfect anymore for some reason, but still decent. Clonidine is too potent a drug for anyone to stay on long-term. It can cause rebound hypertension, among other things, if discontinued abruptly. I had a bad experience after quitting my calcium channel blocker cold turkey. It made me very sick for a week. I had tachycardia and cardiac pain. My doctor ordered me back on it. My symptoms dissapeared immediately after restarting it, but the peripheral edema returned with a vengeance. For this reason, I tried quitting it a few weeks later again, this time under a physician's supervision. My symptoms returned and I chickened out. I guess, like you with Clonidine, I have to remain on it forever.
I took the following every day for reducing inflammation:
Apple cider vinegar - it has to be organic, raw & unfiltered. Essential fatty acids (Omega 3's and 6's) from fish oil, ground flaxseed and mixed nuts; garlic, CoQ10, vitamin C & E, oatmeal and cinnamon. Good diet, green, black and ginger teas, plenty of exercise. This might not work for everyone, but it worked for me.
I hope you'll be able to reduce your blood pressure further somehow.
P.S. The rapid HR could be a side-effect of one of your meds. I have heart rhythm irregularities from the meds. This just keeps compounding the original problem. I wish I didn't have to take them.