Please help while we struggle to replace our heater

My name is Tina Harding and I'm in an emergency situation. As most of you know my husband Andy was diagnosed last year with stage 3 metastatic malignant melanoma. We have spent everyday since that day fighting this with all we've got. He has had many complications along the way and now sees 5 different doctors to stabilize his current condition He still works so hard everyday because all our savings have been depleted paying medical bills. Today we were hit with another setback but this time it was our heater. This morning at some point our burner caught fire and now we have to replace the entire unit costing us 6500 in order to have heat. We honestly appreciate any help and thank you all from the bottom of our hearts.