It does sound like you are going through a very difficult time. What you are calling adrenalin surges could very well be sensations due to menopause because they went away with HRT. However, it is important to talk with your doctor to be sure that there isn't some other medical problem happening. Unfortunately, without an exam and more information, it is difficult to be more specific. But anxiety and hot flashes are both associated with low estrogen. Other reasons can be panic attacks, adrenal tumors, heart arrhythmias as well as other causes.
You might discuss with your doctor alternatives to HRT. Also, some antidepression medications such as Cymbalta are used for both anxiety and depression. Other medications are also used for this purpose.
Machelle Seibel, MD