I haven't done this for years
several years ago, I was talking to my co-worker's mom about how her other daughter's job search was going, and she said that Kim told her she felt awkward about doing interviews because it had been about 10 years since she'd done that. Mom suggested Kim tell them that in the interview, that because she'd been gainfully employed all that time, she felt rusty doing interviews. Must not have hurt, because Kim got the job she wanted!
I say just keep your sanity by remembering these people you're talking with probably hate having to do interviews, too, but it's a necessary evil. Make them and yourself at ease by trying to enjoy the conversation you're having with them. Show a personal interest in the company, and turn things around so that you're interviewing them, too. If you've got experience in an area that they're just now looking into, ask them how they plan to get that up and running, or how they feel their company benefits their target audience. That kinda shows them that you're thinking outside the box.
best of luck with the interviews, and hope you get to feeling better soon.