I know nothing about pumps, but in your position, I would get a GP appointment, explain the problem and suggest that if they gave you the equipment to take a swab, you could seal it up and hand it in at the surgery to be sent off and checked for some sort of infection next time this happens. I think it would be good to rule this out.
I suspect this means you need to talk to a GP who knows from previous experience that you're not an idiot and will trust what you say. Just a suggestion.