From all you said, it just sounds like a Coincidence. I have never heard of that low of THC doing anything like that. Of course, everyone is different and have different effects. If anything, it should help with nausea.
If you have long hair they will probably take it from the end. The detection is more at the root than on the end. I heard it stays for 6 months. There are shampoos out there that will help with your issue.