Stopped Premarin .9...Feel Awful

I recently stopped taking my Premarin .9 mg. I had a total hysterectomy at age 34 in 2004. I tried to taper off by taking it every other day then every three days and then I just stopped taking it completely. I only tapered for a month. I'm wondering if what I am feeling is from not having the hormones now. I stopped due to the concern over the effects of premarin. I am now experiencing headaches every day, feel generally ill, almost flu like symptoms, very tired all the time and am having hot flashes again (this I know is from not having premarin). I have been going through a lot health wise recently...had gallbladder out 6 weeks ago and was hospitalized 2 weeks ago for possible heart attack with low potassium and high liver enzymes. They ran every test under the sun, no heart attack, no issues with the gallbladder surgery. They did find my thyroid to be high and lowered my dose for my synthroid. Can what I am feeling now be from stopping the premarin? I just don't know what else it could be. I'm really on the edge as I don't feel I can take much more. I'm tired of feeling so terrible all the time...Wondering if I go back on HRT if I will feel better. Has anyone ever had this happen to them, any suggestions?