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Hello. Welcome to JustAnswer. I am Dr Z. I'm reviewing your question now, and will post back with a reply ASAP.
Thanks for trusting me to help you and OJ today. I am a licensed veterinarian with over 30 years of experience and would be happy work with you but need a bit more information in order to better assist you if you don't mind.
How long ago was his potassium and BP checked?
Does he appear to be breathing heavier than usual?
Thanks and I will respond further after you reply. There may be a slight delay while I formulate and type a thorough response or I may be offline, but if so, I will respond as soon as I am able.
It may be worthwhile having the potassium rechecked. Ventral neck flexion (holding the head down) is a common symptom of low potassium. Maybe he is not absorbing the potassium supplement well. I also worry about he staring off that he is doing. If he is hypertensive, he is at risk of acute blindness due to retinal detachment. When this occurs, many cats will exhibit odd signs, but it is not always obvious to even the owners that they have lost or are losing their vision. Most times, when cardiomyopathy progresses, the labored breathing is the limiting factor on their quality of life and this occurs both due to fluid accumulation in the chest and due to poor oxygen circulation.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.
You are most welcome. Good luck and please keep me posted as to how things progress.