I'd hold off until Monday. A third one will only add to this mess
Give it some time. It's only 3 days until Monday and good time to step back and reflect
Don't push yourself too much. I'd decline

If you do go...realize why you are going. Don't go just to see him again or to keep talking about the stone. Only go if you truly feel there's no way you can make it until Monday. I believe you can though. You're strong.