Rabbit having sneezing fits

Hi! My rabbit has just started having lots of sneezing fits. I’ve called around and none of the vets near me are taking any new clients/are super booked up. He is eating and drinking normally, he just keeps having sneezing fits and cleaning his face. Are there any remedies I can try at home with him? I’ve had him for 6+ years and he’s never had this issue! I am a concerned bun mom. 😭