Schlumberger - SLB - Making New Highs

I panicked and sold my SLB on August 16th, the day of the "mini-crash" at about $85. Now it's making new highs and trading around $100. That's 17% I missed out on! Me Idiot. I'm thinking about getting back in, but the chart tells me to wait. It is extended and overbought - I think it will trade sideways and digest the recent gains. If it drops enough maybe I'll pounce. Check out the chart.