wow I used to have similar symptoms. Have faith in God.
Some of your symptoms seem as if they could be caused by some form of Dysautonomia. How is your blood pressure? Have you ever had a Tilt Table Test?
look up IST - inapproaite sinus tachycardia!
You say high HR for 5 months, what was your HR before that time, at rest a good reference.
I think 100 and over at rest is too high. Do you know what your blood pressure is? Do you think you HR is just fast, i.e., stable but fast, or is it erratic with what seems to be out-of-step or extra pulses? What is your emotional state when you check your pulse rate? Emotions will raise the HR, and a HR of 85 is a bit high but not alarming, I think.
Have you been put on any medications? A simple beta blocker may be enough lower your HR to 70 or so at rest.
The other symptoms are of more concern, I think, than is the high HR. Dizziness,, nausia, head ache and chills. What about over heating, or sweating? All these symptoms can be caused by a lack of oxygen in the blood due to heart or lung problems. These are problems you doctor should be able to deal with, sorry to read you are not getting more help from there.
Maybe someone else on this Community will come up with something more helpful.. hope so.