In the last year I have developed beginning stages of an autoimmune disorder, gasrtrioparisis, IBS and mrsa. Why is the occurring at once thoughts?

No coincidence. What i always tell my students. One new uncommon problem can happen to anyone. 2 common problems -possible. 2 uncommon problems very unlikely. 3 problems at once all separate occurances - the odds start to become astronomical. Much more likely the problems are all related. You and your doctor should look for a common thread.