Travelling tomorrow and have hurt knee and can’t walk

I can’t believe this, we are due to go on holiday to Crete tomorrow after waiting 3 years due to covid. We have rearranged the holiday twice and we’re so excited. I have badly pulled a muscle in the back of my leg and to put weight on it is truly painful. Today is worse and I don’t know what to do - I cant even walk to the kitchen. I thought I’d call the insurance company but they close at 1 on a Saturday then open Monday. Do I go and hope to get a wheelchair at the airports and resort. Do I forfeit the holiday. I am so sad and frustrated