Dear Ven Fiona,
I was able to check extensively about your situation and I am doing pujas for you tonight. It is extremely important that you do Medicine Buddha puja as soon as possible. If possible, your mother can also do this for you and also students in the area.
Attached is the visualization to do and link for the correct puja. Basically, you visualize the seven Medicine Buddhas above your crown and one by one they absorb into you and purify the four things (in the attached document). This is also the visualization your mother and others should do for you.
You need to recite the Long Life Sutra 60 times. Do as many as you can, then, if you are able, arrange for someone else to do the recitations (the best would be your Mum because of the karmic connection, but if that is not appropriate then friends).
If you can email your postal address I want to send you some blessed water to sip.
You need 300 long-life tsa-tsas made for you. I can arrange for this to be done in my house.
Read and study the five powers at the time of death. This is something I have just finished. It is something we all should be familiar with.
Now you should do tong-len practice, as much as you can.
I am making prayers for you and send you my love and prayers.