I was infected by H. pylori about 15 years ago, and my ps started around the same time. The infection was cured ten years ago, but the ps is still here, and has spread. Perhaps the H.p was a trigger, but it's difficult to say.
Around the same time (15 yrs ago) I took antibiotics such as Fasigyn, and chloroquine against malaria (was living in the tropics). Chloroquine could have been a trigger?