how to detect if the touched part is in front of the humanoid?

Sorry for any English mistakes, not native.

I have two problems in my double jump script.

The first one is that when the player tries to jump against a wall the humanoid is supposed to turn 90° to trigger one of the wall jump "sentences",the problem is that the Upper torso and head have hitboxes that sometimes don't colide with the wall.So I tried to use their positions using CFrames,but i'm terrible at CFrames and don't know how to do it.

The second problem is that when the walljump get trigged the player can spam it forever in the air because the touched event humanoid part still the same even after the touch ended,i tried replacing the hl name after the event occured but it doesn't seen to work.

local acceleration = require(workspace.acelleration)
local UIS = game:GetService("UserInputService")
local localPlayer = game.Players.LocalPlayer
local character = game.Players.LocalPlayer.Character
local humanoid = script.Parent:WaitForChild("Humanoid") 
local root = character:WaitForChild("HumanoidRootPart")
function walljumpright()
    humanoid:ChangeState(Enum.HumanoidStateType.Jumping)
            root.Velocity = (root.CFrame.RightVector*-1+root.CFrame.LookVector*0.2)*(40+acceleration*2)

end
function walljumpleft()
    humanoid:ChangeState(Enum.HumanoidStateType.Jumping)
            root.Velocity = (root.CFrame.RightVector+root.CFrame.LookVector*0.2)*(40+acceleration*2)
end
humanoid.Touched:connect(function(tp, hl)
    if hl.Name == "LeftUpperArm" and humanoid:GetState() == Enum.HumanoidStateType.Freefall then
        game.StarterPlayer.StarterCharacterScripts.doublejump.Disabled = true
        print("leftsurface")
            UIS.JumpRequest:Connect(walljumpleft)
        end
            if hl.Name == "RightUpperArm" and humanoid:GetState() == Enum.HumanoidStateType.Freefall then
                game.StarterPlayer.StarterCharacterScripts.doublejump.Disabled = true
        print("Rightsurface")
        UIS.JumpRequest:Connect(walljumpright)
            end
            if hl.Name == "UpperTorso" and humanoid:GetState() == Enum.HumanoidStateType.Freefall or
             hl.Name == "Head" and humanoid:GetState() == Enum.HumanoidStateType.Freefall then
        print("middlesurface")
        root.CFrame = CFrame.Angles(0,math.rad(90),0)+ root.CFrame.p
            end
                game.StarterPlayer.StarterCharacterScripts.doublejump.Disabled = false
            hl = "placeholder"
                end)

here's the walljump script. The second problem I see some ways to fix , so the first problem is the most important one.