Ashland 12-mile is a no go for me

So I heard bad news today, I'm not allowed to do any physical activity for the next 3-4 weeks because of my mono. I had an ultrasound to check my organs and it turns out I have an enlarged liver and spleen, and if I were to crash or even just by applying pressure to it I could rupture it and possibly die. Its unfortunate but I have to live with it now. Should be good to go for the races next month though.