How did you find out about your infestation?

I have been battling terrible fecal breath for about 5 years now. Lately, Ive been experiencing headache, lack of appetite, itchy anus. Sometimes my right ear will ring for a minute and go away. 5 years ago, when I had a massive panic attack from what was diagnosed as gerd, ringing ear persisted for about a week, but went away eventually. I used to get sensations of bugs crawling under my skin, but haven't felt it in maybe a few years.