If your sauce is too spicy for your liking, you can dilute it with water, broth, or vinegar. Or you can neutralize the spice with the addition of a cream like yogurt, coconut milk, or sour cream. Naturally, this will affect the taste (probably in a good way... that coconut-milk addition sounds really good!). You can also add some sweetness to the sauce in the form of honey or maple syrup; this should take attention away from the spice.