What to do when cancer symptoms worsen but you can't get to doctor?

Hi everyone, I'm new here and I have lymphoma. And melanoma that was cut out of my back and neck they said they got it all but I knew they did not for some reason well now I have a golf ball size lump in my armpit and the pain is unbearable at times and im now to week to walk 2 blocks and my only means of transportation just got impounded 4 or 5 days ago when i was helping a single mother of 4 move because she had no help and were i parked it i did not see a sign because it blends in with the wall and i did not know that they could just have your car taken with out notice and that was also my home i have tryed to get ssi but that is going slow and now im having a hard time getting to the doc and all my famley have passed im all a lone in this battle i even had to go through sergry a lone and dont know were to get help at this point im ready to give up and just let it have it wayand i dont know what else to do if i lose my truck that will pritty much end it for me