I get skin swelling (like insect bites) from a week

Last Monday night I ate white butter from market and about 1 hr afterwards I started getting itchy insect bites like swelling all over my body including face and scalp. Anti allergy helped for only few hours. Mixed black pepper with desi ghee as a home remedy but that too is giving temporary relief.
Here are some pics

Kindly suggest some home or ayurvedic remedy

It looks like urticaria. See below link for more details: