what you can do as sariel was saying is energy manipulation which is the main key in defending your self. now i will try to go a little more in depth.
To start with cleansing is a good start to clear the area of negative energy produced by wicked hexes, which in turn will help to negate the effects of the enemies spells. I advise to burn some dried white sage (You can by sage smudge sticks) around the home visiting every corner and smudging your self . Also accompany your smudging exercise when smudging yourself with a white light cleansing.
step 1: Visualize your body while burning the sage
step2: See the brightest white light you can imagine, see it dark spots in your body as effects of any negative energy, do not logically create an amount of spots, let the intuition create that amount for you. Visualize the light bobbing up and down and about the body , making the dark spots vanish, see your whole aura become brighter and your energy system get healthier
Next step after cleansing is Shielding, you can read my post shielding 101 for more info on it.
Shielding is when you create energy walls to protect you from enemy spells,
And finally the offensive part, getting an idea of the type of spells was used against you is the best way of knowing how to deal with it, but even if you don't know you can still break the spell.
What i will say to do first as a preventative measure to prevent more damage is to bind the attacker. You don't even have to know what they look like even though that will be a plus. You simply focus on the enemy while doing a binding , this restricts them from using their magickal talents.
And following up you can write up a incantation to attack back, learn to "push energy" and fight back. anymore questions feel free to mail me.