Rinpoche read your emails and checked extensively for you. What came out best for your health at this time is for you to do the practice of Most Secret Hayagriva, reciting the mantra every day with concentration. You need to recite four malas of the mantra each day.
I assume you have not received the initiation. This means you can’t arise as the deity, but just have the deity absorb into you.
This is the meditation:
First generate the motivation for doing the practice, that you are doing this for the benefit of all beings.
Then think Most Secret Hayagriva is paying attention to you, with lots of compassion for you and for all sentient beings. Most Secret Hayagriva sends light, which goes through you and also goes to all beings, like a dark room that is lit up. The light dispels all the sickness, especially your cancer, disease and spirit harm, and also from where these come—all the negative karma and defilements.
Recite four malas per day of the mantra:
HRIH VAJRA KRODHA HAYAGRIVA HULU HULU HUM PHAT
At the end, think you are totally purified, then the deity absorbs into you and you receive all the qualities. Think you and all sentient beings are totally healed.
Then dedicate the merit. You can use any of Rinpoche’s dedication prayers, just one or two or whatever you wish.
I am attaching a picture of the deity for you to look at when you recite the mantra. You can print this and frame it. It should not be on display for everyone to see; it’s better to keep it hidden and then open a curtain to look at it when you do the practice.
This was Rinpoche’s advice to you. He has also been doing prayers for you and will continue to do so. The Sangha at Rinpoche’s house are also praying for you.