It sounds like a conditioning issue to me. If you haven't ridden at all for six weeks, you're going to feel that on climbs. Don't fret though. You're back up to it. Get some flat miles on for the time being and start doing some work on the trainer over the winter.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher