how to live with immense food allergies

Like a month-ish ago I went to the doctors for my three month checkup and was informed by my doctor that I am allergic to everything. I have Celiac's disease which means no wheat, barley, or rye, I'm allergic to citrus, and lactose-intolerant. So basically I can't eat anything. The good news is that this should mean I will lose weight. But by starving myself because I can't eat. If you have any suggestions, let me know!