I will add a comment to what I perceive to be an emerging consensus. With each deep(er) dive, you will gain a degree of additional experience, and comfort. That doesn't mean that you will never feel anxiety again, but that you will probably be less likely to feel 'panicked' at a given depth - basically, you will have more of a 'been there, done that' mindset, and you will be comfortable that you can handle it. And, I DO NOT mean you will become complacent. Rather, your experience window will have widened, so 100 feet, as one example, will no longer be new and unknown.I'm a new diver . . . when it was time for my deep dive checkout the following day, I panicked. My mask felt too leaky, the dry air was making me uncomfortable, and the poor visibility scared me. I made it to only 40 ft before I was hyperventilating and abandoned the dive. . . . Advice please!
When I did my AOW Deep Dive, it was Dive #11 for me. It was in cold water, in a quarry, and we had to pass through a murky layer on the way down. But, I managed to get to the bottom, at 75 feet, and the visibility was actually better than at 40 feet. Still, I was (really) glad when we started the ascent.
When I went to 100 feet for the first time, I remember seeing my computer depth window move from two depth digits to 3, and feeling somewhat anxious, and thinking, 'OK, I did it, now I want to get back up to 75 feet where I am more comfortable.'
Then it was 131 feet, with the same feeling. In my tech training, we dove on a boat at Forty Fathom Grotto, where I hovered at the stern, at 147 feet, thinking, 'I can do this, I can do this', but being really happy when we started our ascent. My instructor even asked afterward, 'What was so fascinating about the stern of that noat?' Then, it was 165 ft with that feeling of anxiety driving me to 'git 'er done' and begin my ascent. Then it was 200 ft, then it was 250 ft, etc. It is a progression of experience and learning, much like anything else. I honestly don't know if there is a shortcut. What I do know is that is is quite possible that the second time you try the deep dive you will think, 'Why was I bothered by this the first time?' And, if it doesn't happen the second time, it may happen the third time.
You are not alone. Many, if not most, of us feel nervous the first time / each time we expand our envelope of experience (and live through it). And, with each subsequent 'expansion' we gain a little more confidence, based on a little more experience, and reset the limits of our 'window'.