how to fix While condtion firing even though variable is false?

I made customs stats for players. If the player gets damaged they cannot heal for 5 secs but the player still heals while printing "cannot Heal" which only happens if they recently took dmg.

if script.Parent.Parent.Name == "Backpack" then
	print("player found")

	local Hum = script.Parent.Parent.Parent.Character:FindFirstChild("Humanoid")


	local Speed = 30
	local Health = 145
	local Jump = 70
	local Regen = 3
	local RegenRate = 0.7 --seconds

	local healing = false
	local RecentDmg = false

	Hum.MaxHealth = Health
	Hum.Health = Health
	Hum.WalkSpeed = Speed
	Hum.JumpPower = Jump
	oldhp = Hum.Health 


	Hum.HealthChanged:Connect(function(hp)		
		if hp < oldhp then
			if RecentDmg == false then
				print("Cannot Heal")
				RecentDmg = true
				wait(5)
				RecentDmg = false
				print("can be healed")
				end
		end
	end)

	while true do
		local rate = wait(RegenRate)
		if RecentDmg == false then
			while Hum.Health < Hum.MaxHealth do
				if Hum.Health < Hum.MaxHealth/2 then	
					print("Regen Has been Doubled")
					Hum.Health += Regen*2
					wait(rate/2)

				else
					Hum.Health += Regen
					wait(rate)

				end

			end
		end
		end
end