Why Isn't the BillboardGui Showing?

Okay so This script creates buttons that when you click it, it should make a billboardGui apear above the players head, however the billboardGui isn't showing up. I get no errors, and this is a local script.

local SGui = Instance.new("ScreenGui", script.Parent)

local Clickme = Instance.new("TextButton", SGui)
	Clickme.Size = UDim2.new(0,100,0,50)
	Clickme.Position = UDim2.new(0,300,0,50)
	Clickme.Text = "Click Me"

player= game.Players.LocalPlayer
char = player.Character
head = char:WaitForChild("Head") 

Clickme.MouseButton1Down:connect(function()

local Frame = Instance.new("Frame", SGui)
	Frame.Size = UDim2.new(1,500,0.5,100)
	Frame.Position = UDim2.new(0,490,0,100)
local CD = Instance.new("TextLabel", Frame)
	CD.Size = UDim2.new(0,100,0,50)
	CD.Position = UDim2.new(0,20,0,10)
	CD.Text = "Common Diseases"
local UD = Instance.new("TextLabel", Frame)
	UD.Size =  UDim2.new(0,100,0,50)
	UD.Position = UDim2.new(0,150,0,10)
	UD.Text = "Uncommon Diseases"
local RD = Instance.new("TextLabel", Frame)
	RD.Size = UDim2.new(0,100,0,50)
	RD.Position = UDim2.new(0,270,0,10)
	RD.Text = "Rare Diseases"
local URD = Instance.new("TextLabel", Frame)
	URD.Size = UDim2.new(0,100,0,50)
	URD.Position = UDim2.new(0,390,0,10)
	URD.Text = "Ultra Rare Diseases"
----------------------------------------------------------- Labels ^
local Stress = Instance.new("TextButton", Frame)	
	Stress.Size =  UDim2.new(0,70,0,50)
	Stress.Position = UDim2.new(0,20,0.1,30)
	Stress.Text = "Stress"
Stress.MouseButton1Down:connect(function()
	local gui = Instance.new("BillboardGui",char)				<----this area of the script
	gui.Adornee = head
	gui.Size = UDim2.new(0,100,0,50)
	local frame1 = Instance.new("Frame", gui)
	local stress1 = Instance.new("TextLabel", frame1)
		stress1.Text = "Stress"
	SGui:Destroy()
end)
-------------------------------------------------------------

local GallStones = Instance.new("TextButton", Frame)
	GallStones.Size = UDim2.new(0,70,0,50)
	GallStones.Position = UDim2.new(0,20,0.23,30)
	GallStones.Text = "GallStones"
GallStones.MouseButton1Down:connect(function()
	SGui:Destroy()
end)
-------------------------------------------------------------
local Appendicitis = Instance.new("TextButton", Frame)
	

end)