yes, you are being paranoid

Dealing with CBP is not "dangerous" lol It's only hazardous to your health if you're trying to enter the US under false pretenses, are lying, or have commited some kind of a crime. If you're on H4 status, then it's my assumption you've been cleared for entrance in the US and are admissible.
As for the TN, if your application is valid (you've got the proper credentials, are applying in the right category and can prove non-immigrant intend), it should be granted. I dont think officers are out to deny as many
TN applications as they can for the heck of it, they're just trying to weed out the false ones. I never realized that people actually try to enter the US under fake TN applications until lawrlaws told the story of some guy applying for a TN, while in reality, he was going to be a store clerk at 7 Eleven or something lol
If you need more info on TN, look at
http://www.tnvisaexpert.com I found it quite useful when I was going through the TN process myself.
I'm fairly certain that if your TN application was denied, you would still be on H4 status and could go home to your family, since you're H4 would still be valid. I'm not 100% sure, so someone else might want to chip in on this. But try and avoid getting denied by showing up at the border well-prepared and with a legitimate and well-documented application.
Good luck!
