What to do against chronic back-aching?

The tips on the internet ain't helpful and the doc can't go out of drunk state.

First day at my job and once I got home I immediately crashed into my bed and woke up at 3 AM.

For some reason I still feel physically tired. Even though I woke up by myself (no distractions from my environment).

+ I feel like having worked out even though I did not. I can feel the muscles aching everywhere in my body.

Anyway back to how it went...
I got there (company) and met a young people like me who are also working in this company for the first time.

Once I saw them + the chief and the leaders, my anxiety kicked in, but I made sure not to show it.

We took photos and saw the cubes (data center cubes) and it felt like I was in a hacking scene from Mr Robot or Watch Dogs lol. It was so cool.

After that we were assigned to our temporary work places and mine was at a place where you get packages from the delivery trucks, cut them, sort them, put etiquettes on them and register them in the system.

Another boy (let's call him Daniel) and me were assigned to this place. He is going to be a sys admin.

The people at this workplace were very chill, cool and mature.
You can joke with them and they will not get offended (looking at you, Twitter) lol.

Daniel however is the opposite.
He is so god damn extroverted that he literally won't stop talking.
At some point he asked me if I was even listening and I admitted that the unconcious side of the brain of mine built a filter over the years that only let's valuable information flow through. When there is no valuable information, I do not process them in my conciousness.

Poor guy got a bit sad, but me whatever. Not my problem. He gave me an headache by talking nonstop nonsense.

Today, when my shift begins, I will learn to do drive a forklift and I'm excited about this.

I do not even need a license for it which you normally need in other companies :D