Simple home remedy for a headache or migraine: submerge hands and feet in warm water and put an ice bag or bag of frozen something at the base of your skull. The heat on your extremities pulls the blood from your head relieving some of your headache.
Heat a spoon under hot tap water and press it onto the spot. The heat will destroy the protein that caused the reaction and the itching will stop. But what if I have 7 mosquito bites at ONCE? I can't hold that many spoons!
Shower head covered with nasty hard water deposits? Pour distilled white vinegar in a plastic bag and fit it over the shower head with a rubber band. Let it soak for an hour (or overnight) then remove the bag and wipe scum away with a cloth.