It's interesting that it affects people so differently. It takes a whole lot of coffee for me to even feel jittery; most of the time it's just a pleasant boost of emotional energy. Like an anti-depressant. I feel excited about life and ready to go dive into it. That's the main reason I drink it most days; not to keep myself awake. It just feels good, seemingly without downsides.
Maybe you're simply sat in your office chair for too long every day and just need to go for a wander once an hour to get the blood flowing.
Quitting caffeine is just one step, but if it's not what's causing your issues, don't forget to look into other aspects of your lifestyle,
I have given it up a few times, but have never really felt better or worse for it.
What was worse was if I had to drive. Same issue. Comfortable chair, light vibration from the car, warm interior, not much going on going straight on the highway, and I start dozing off. Coffee prevents that from happening. In desperate times I would start to rip out a leg hair every now and then to keep myself awake, or slap myself quite hard in the face. I keep emergency caffeine pills in my car now for this purpose.
https://lifehacker.com/what-caffeine-actually-does-to-your-b...
Interestingly, I also quit fairly quickly, about two years ago. Honestly though, I did not experience such major, obvious benefits. I was definitely overdoing coffee in the past, and when it got to the point that I needed two strong ones before 9AM to get going, I decided it's time to stop taking loans out against my sleep.
But basically post-quit, I have similar levels of energy/tiredness, overall (compared to a normal, on-coffee day). It's just less peaky and trough-y, and sleep is more predictable. The main difference I would say is that on that rare occasion when I now have a coffee, it has an extremely sharp effect. It's pretty odd, and I'm wondering if people are overblowing the effects, or if I'm just the odd one out.