Why do I seem to store excessive static electricity?

This problem has significantly affected me, believe it or not. I always have been shock-prone, but in the last year, it has reached an intolerable level. Everywhere I go, it seems every doorknob, car handle, or surface shocks me when i first touch it! I have begun to have anxiety at store doorways and when closing my car door. I literally "plan" the initial touch. Often I will go out of my way to use my knee or elbow (or even my purse as a barrier) instead of my hand because the shocks aren't as severe--barely noticeable! Even 2 dryer sheets in every dryer load and those aerosol anti-static electricity products don't eliminate the problem. I keep 2 cans of anti-static aerosol at the barn too, because I was shocking the hell out of my poor horse when I brushed him. I actually have to spray the brushes and the horse down prior to grooming him! It doesn't work that well but at least it helps some. I got rid of all his poly and nylon bristle brushes and got brushes for him made of naural fibers and horsehair which helped a lot. Because of that, I figured I should stop wearing nylon, acrylic, and polyester clothes. I hated to drive wearing synthetic facrics because then the shirt would cling irritatingly to my back. Also, whenever my husband would affectionately rub my shoulder or back, instantly I'd get annoyed by immediate static cling and electricity! Realizing this was really creating some pretty negative quality of living issues, I went out and got several pieces of 100% cotton clothes, and for a week, I wore only cotton. The clothing change made a remarkable improvement, thankfully. Tonight, I wore a dressy blouse to a party and was miserable within 30 minutes. I could hardly wait to take off that polyester blouse. I pulled it off, crackling and zapping and wondered what the heck is up with me and all that shocking? No one I know endures so much static electricity torture! And I'm not talking about little zaps--these shocks are super strong, a very uncomfortable voltage! As far as home humidity, It's fairly humid most of the year. We have an evaporative cooler to cool the house most months of the year, and during the 2 months we turn the heater on, we kep the thermostat low. Can anyone shed some light on my plight? Why is this happening? Is there anything more can I do?