Hi Tobias,
Welcome to OCF and I am so sorry to hear about your recent diagnosis. I had similar stage 4 on my tongue out of nowhere five years ago. It is a long treatment and recovery process, many months or longer, and everybody responds differently and recovers differently. I can tell you there is hope. As you bounce around this site you will find many survivors that have been through this difficult path, and some of them 2 or 3 times. Yet, they find full lives out the other side. They inspire me.
As Chris and Mike advised, there is much to this process. And, it is often best to answer questions over time as it becomes overwhelming and hard to retain everything in one sitting. I will send you a private message with my cell number. Click on the envelop upper right of this screen to the left of your name and you should see private messages. Feel free to reach out to me via text or call.
A couple quick notes to reinforce what Chris and Mike said. Stay active, if just a one mile walk outside, so important to peace and recovery. Journal everything, whether written or video or audio notes. Journal your fears, your medical questions, your thoughts. I would wake up worried about whatever, jot it down, next thing, it would be 4 hours later and I found myself writing about my family, notes about growing up, things I wanted to make sure were shared with my loved ones no matter what. I would track my calories, weight, yoga, prayer sessions, you name it.
I am gonna cut myself off now and send the private note to you. Stay safe and keep the faith.
Nels