Again, while a knee is not the same thing as the spine, I have had both knees operated on and have squatted over 800 raw about 15+ times since. The fear is GOOD. The fear keeps you honest. The fear drives me to try to be perfect.
I am scared that if I don’t do my rehab/mobility work that I will re-injure myself, so I do it religiously. I am scared that if my technique isn’t spot on that I will re-injure myself, so every rep is taking with extreme attention to detail. I am afraid that if I don’t maintain structural balance and integrity I will re-injure myself, so I never skip accessory.
See where I am going with this?
If you’re doing everything right, you must trust in the process and trust in the fact that you have done everything you can. Follow the plan and load appropriately. Trust that you’ll never get under a weight you aren’t prepared for because you’ve done everything in your power to get ready for it.