You've lost too much weight, and it seems to be increasing, to NOT see a doctor. If you have to, go to the emergency room of the local hospital, and submit yourself as medically indigent if you have to. But call the county where you live first, and see if they have some help for you, either locally or from the state you live in. Also see if there's a church that might be able to help. Praying for you brother. You're my age, and I can't fight-off things anymore like I could when I was in my twenties and hod-carrying for three overbearing bricklayers... lolol Best of luck to you.
"There but for the grace of God, go I."
"... His mercy endureth for ever."