One can work with one's own muscles. It is best to be gentle and playful. Just feel how the touch of your own hands feels, instead of trying to get rid of a symptom and worrying about finding the right trigger point.

The word trigger point is just a word, most of them coincide with acupuncture points. See where you feel like going a little deeper when you massage, how much pressure a particular spot wants. Go with what feels good, get acquainted with your body and say "hello feet, I am here to get to know you". Starting with the feet is a good idea.

Who knows what happened during that deep tissue massage, but your symptoms seem to indicate tension.