Lemmy is amazing. I am so glad I found my way here. I was doom scrolling as well. I had to unsubscribe from all my political communities I had joined and just keep one of my news committees. I then expanded the groups for my other interests. This really helped. You are in control of your time line here.

hexbear is true garbage.

Beehaw is not worth the effort. Their audience is way too sensitive to participate with any reasonable level of social interaction. You will live on eggshells if you wish to participate there,

They are just two different servers. Lemmy.World is one of the really big ones. I had an account there but because of the size there were a lot of performance issues. I would recommend you join one of the smaller servers like sh.itjust.works. You have access to almost all the same information on the Fediverse.