So, I did the quest to close the valves underwater and got really high radiation. Now even a fly just need to touch me and Im dead. So, my question is: how I reduce my radiation so early in the game? Im 2h in game, just discovered Concord, Satuary and another setlement the Minutemen guy sent me. I dont know any doctors and dont have radaway. Where should I go?

Rank 1 of Aquaboy/Aquagirl stops you from getting irradiated whilst standing in water, and also gives you 'water breathing'. First perk I took and no regrets

Im happy for you.

But, did someboby found radaway or a doctor somewhere?

Why ask a support question if you're just going to react like this? I was suggesting a way to prevent you from being irradiated by water in the first place. As for radaway or doctors, try one of the larger settlements like Diamond City.

Sorry if I sounded ungrateful, it was not intentional.

No worries. Hope you find some radaway, in the meantime I would seriously consider taking the perk I suggested at some point. It's actually very cool approaching your enemies from water where possible, even if it's shallow. Tends to be a lot stealthier than following established routes or pathways

Rad-X and Radaway are plentiful in the Commonwealth. Head back to Concord and scope out the Workhouse and Speakeasy. There ought to be some to scavenge if you poke around a bit. Mind yourself though - you don't want to get caught out in a Radiation Storm with that much radiation sickness.

You can also mke radaway. Dont recall formula offhand and not in game at moment but it didnt require super rare compoments.

Best i recall it was purified water + something else

Water can be purified by another conversion so that isnt issue to get early game, and i think other part was the glowing fungus you get as part of very early first missions near the gas station just away from sanctuary, the mole rate cave iirc.

Ah yea, memory back now - glowing fungus harvested from cave just near gas station plus purified water lets you make your own radaway

There's a doctor at Covenant that can cure you of rads too.