Some suggestions/sollutions for People that suffer at such situations (not specially towards the op, sounds like he know how to do better)
(Hope i make no mistakes, didnt played since christmas)
1: Stay away from Dangers you cant stand. Means yes, if your equipment is to weak maybe dont loot houses the first days
2: Beer, Painkillers and Grain Alcohol make you immune against stunlocks
3: Block Doors with frames to get the few seconds you need to escape
4: Armor, armor is a real gamechanger, wear so soon as possible so good as possible armor
5: If you enter a room like in the video, at the moment you see that in the room to the right is no awake Zombie, dont start fight, first look in the room to the left (Specially if you dropped no frame in the door)
6: Why enter houses from the maindoor ? How about entering the houses from roof ? Most houses have wood floors. Destroy the floor and shot through the frame that stays (but be carefull NEVER jump down in a house you opened no way out, sometimes you end up in a 4x4m room with a dog that spawns after you jumped in)