Do i need Damp Proofing?
Firstly if the damp is around the door, then yes i would say you need to reseal the door (there should be a bead of silicone were the door joins the brickwork, if not or if it has cracked open then simply reseal it with some silicone sealer/frame mastic). As for the upstairs wall, you say the whole wall is damp, this could be caused by leaking/overflowing gutters causing water to run down the outside of the brickwork and breach to the inner wall. If it is just around the window probably same as the door. Heating and ventilation will also help a lot with the damp.
