Endocrine Withdrawal Syndrome after stopping HRT

Hello,
I am wondering if anyone has experienced endocrine withdrawal syndrome after stopping hormone replacement therapy? I am 54 years old. Last June, I was prescribed Premarin .45 and 100 mg progesterone daily to combat hot flashes. I felt great the first month, then felt horrible by September, like I was overmedicated. I then stopped cold turkey. Two days later, I was awoken in the middle of the night by a heart rate of 155 and high blood pressure that lasted a few minutes. I went to ER and they couldn't find anything. A month later, I started having tachycardia episodes, high and low blood pressure episodes, shaking, extreme insomnia, feeling like I was wired, anxiety and dread, etc, all day and night. After 3 paramedic visits, 2 ER visits, an endocrinologist, rheumatologist, cardiologist, gynecologist and a PCP, all giving me a full workup and blood tests, they didn't find anything wrong with me. I felt like I was going to die. I ended up couch bound for 7 weeks. The endocrinologist thinks I may have had endocrine withdrawal syndrome that mimicked opioid withdrawal syndrome. Apparently this can be a thing after discontinuing estrogen. He put me on .25 divigel and no progesterone. I am slowly stabilizing, but still have occasional symptoms that are or mimic POTS (postural orthostatic tachycardia syndrome). I can function somewhat but am nowhere near my original energetic self and it is destroying my life. Has this happened to anyone else? How did you fix it? Thank you.