I'm planning on going cold turkey soon, it'll be my third time getting off coffee in the last 2 years. Headache and mood is going to be a pain in the ass.
Discussion
How will it last until headache and shitty mood are gone? Couple days?
What to do to prevent it?
Everyone is different, I had these symptoms for 3-4 days. To prevent or minimize them, you could slowly wean off the coffee but that didn't work for me, I'd always end up drinking more. So I just bit the bullet.