Removed interior wall, dimensioning of beam, glulam or steel?

[Slim_]

Currently renovating the living room and have some considerations about what kind of beam could replace the wall that is gone.

What is the TV room and living room on the plan has been one room for the past 10 years; when the wall was torn down, a 65x180 beam was installed to take the load from the floor joists above, which I believe is barely sufficient since there is sagging in the floor above.

I would like to lower the ceiling in the living room so the beam fits inside, but if I have to cover 180mm the ceiling height will only be 2.20. So I tested http://www.byggbeskrivningar.se/dimensionering, and if I did everything correctly, a 115x405 is needed! I wanted a smaller one
Have I calculated something wrong? Otherwise, maybe I should look into a steel beam that can have a lower height if someone can calculate that?

Am I wrong to think that the load on the beam only comes from the floor on the upper floor?
It is 1 1/2 story with a mansard roof, should it burden mostly on the outer walls?

In the half of the house that the beam should support, the upper floor is 33m2.




Picture of the existing beam and floor joists.