Girls, hello. I have sinusitis and I'm breastfeeding. How can I cure it…

Girls, hello. I have sinusitis and I'm breastfeeding. How can I cure it, because I'm already exhausted. I saw a doctor, she prescribed me pills that you can't take while breastfeeding. There are contraindications in the instructions for pregnancy and lactation. I told her about this, she says there is nothing wrong with it, that it's okay. But my inner feeling doesn't inspire confidence. Can you tell me how someone has treated it? Maybe a spray, could you recommend one?