Poor care by a doctor

Can I take legal action? Went in to Emergency room (10/11/2024) as private patient. Broke bank account paying R3000 for ER and R3500 for dr just before Christmas. The care from nursing staff was great. The dr seemed hasty impatient and annoyed. We decided to put on a cast on my broken scaphoid which annoyed him even further. I told him the cast felt tight. He brushed it off said it would get better. Now I cant feel my thumb and want to get it seen to. However im told i must pay more. This will bankrupt me. Is there a legal route i can take against the dr? As a self employed chef protecting my ability to make an income is important.