Should I just suck it up and go?! Help!!

My friend wanted to hangout today because we haven’t seen each other in a while since we’ve both been busy. I told her I would come over and she called me a couple hours ago to see if I still wanted to come because she is lonely and depressed. I fully planned on going but I think I threw my back out. It hurts to even breathe. It’s taking me so long to even get dressed and ready. I feel bad because she it the type to get upset if you cancel on her and get petty and intentionally cancel on you next time. Should I just suck it up and go and be there for her? Or should I just stay home and rest? I hate disappointing people but it hurts so bad and she keeps texting me “are you coming yet”. 🥺