Hi I Have Been On Oxycontin For Around 7 Yrs

Hi I have been on oxycontin for around 7 yrs prescribed to me by only 3 Drs all in which I have had for a couple of years at a time. My problem now is the Dr I had has been deregistared and when i see another Dr and mention his name and what meds I need they tell me they cannot help I have genuine medical conditions in which I need this medication and I feel I am being discriminated against because of this can u give me some advise or help me in any way plz thank you. Leanne