I do a similar thing these days. I lost my trust in doctors (which appear to be turning into the IT industry real fast...bad) one an emergency visit. I was having heart palpitations at seemingly random moments. When it happened on an airplane, it really freaked me out. So I went to a doctor as I was going to fly to Europe and didn't want it to happen again. They did an EKG and blood tests. They found nothing and said it must be anxiety. Anyone who knows me knows I am the least anxious person out there. And this didn't happen when I was actually anxious. I told that to the doctor, but his diagnosis stood. I don't know what the heck he prescribed. I never used it.
No problems overseas for that whole week after it was happening nearly daily.
After I got back, it was happening again. It was really bad when I was driving home one day after work. I thought about what I did that day that was WAY more than typical. I thought about how I drank like 60 oz of Coke Zero. I stopped drinking it for 2 weeks. No issues. Drank it again to see if it was an issue and had heart palpitations in about 12 hrs. So I looked at the ingredients, cross referenced the Internet for heart beat issues, and BAM. I found aspartame. I stopped drinking Coke Zero again and had no issues. Then I chewed some gum as a test and the symptoms came again.
The next time I went to the doctor (swine flu), I told him that I found the palpitation issue and described everything I found. He appeared shocked. Maybe he took it to heart, but I don't know. Every time it happens now, I can look back at the last 24 hours for anything different that I ate. I always find aspartame. It now happens like once a year, which happens to be when someone puts that crap in brownies or something.
For the record, no issues with other fake sugars.