How do you cure Caffeine Intolerance/Allergy

In my early 20s I was a long distance runner with highly controlled diet and training. I soon realized that caffeine was causing me muscle pulls.  When not in training I had no problem.  In mid thirties I began having issues with caffeine again, but causing occasional vertigo and lower back pain.  At age 45 all hell broke loose.  My legs starting going.  Again I traced it to caffeine.  Withing 5 years I was a deadman walking. Today I am 57.  If I was to drink a cup of coffee, eat a chocolate ice cream cone, or drink a coke, I would be dead or near death.  The last time couple of time I tried, about a year apart I almost died and did not totally recover physically.   In all honesty, I think I have ALS but because I am staying away from the trigger, I live. Caffeine could be the cause of all muscular dystrophy.  Can someone work with me to find a cure?