Dear Jackie,
I spent some time checking for you and this is my advice. Do these things first, then see how the situation is. To start, this is mainly for the eye, but also should help with the cancer as well.

1. You, or someone else, should do the pacifying and increasing fire puja of Cittamani Tara. It is better to do it in the area where you live.

2. Chab-trü: Have this performed for you five times. The Rinpoche you know could do this for you. This is for purification, especially of pollution, and healing. When it is being performed, you should visualize purifying the four things (disease, spirit harm, negative karma, and defilements), and visualize your eyes becoming purified and healed.

3. Blessing with Dorje Namdrol while washing in the morning. When you do this, visualize purifying the four things (as above). I am attaching the practice.

4. Have Ven. Chodron recite 10 malas of Vajrayogini mantra without talking, and then blow with some spit into your eyes several times. Visualize the four things are purified (same as above).

After all this is done, we can check again and see how things are for you.