Any standard healing spell will work for a cold. Doesn't have to be exactly for colds. I'd personally get together some herbs for health and put them in a pouch to keep under my pillow as I rested up along with lighting a green candle for healing power for a couple times a day. On the candle I would carve a symbol of healing or health on it to help focus the energy of the candle to the purpose...especially with it being hard to keep focused when sick.
Get better soon!