Minor setback

So I woke up yesterday with soreness in my left arm. I figured maybe it's just from sleeping on it wrong, but the pain got worse throughout the day. Then I was thinking, well, it's no big deal because it's only when I straighten my arm, and I keep it mostly bent when I ride. Today, I woke up with the same pain in my arm, but I was still thinking I'd be able to ride with it because it was just sore, not really affecting riding. I planned to ride tonight when I got home from the grocery store, but as we were getting the bags out of the car, I tried to lift one of the bags with gatorade bottles and I almost dropped it on my foot. Apparently, it's worse than I thought, because I cannot handle a lot of weight, thus riding is out for at least the next couple days (unless I get a miracle and my arm feels better all of a sudden). Grr!