I crashed pretty badly Oct. 9th and broke my collarbone, cracked a rib, punctured a lung slightly..sounds similar to yours. Didn't catch the broken collarbone at first on the x-rays. I took 3 days off, began riding again, a week later when things were still hurting badly I went in for a follow up and found the collarbone, which was separating considerably. I chose to have it plated and had surgery a few days later.

The surgery was like night and day. I would encourage you to do it if it's an option. I was back on the bike within 3 days, I'm now about 2 months out and have pretty much regained full function. Being unable to sleep for a while was the worst of the recovery.

One caveat: I understand that an AC separation, and the attendant surgery, recovery, and therapy, are worse than a collarbone break. Often the joint must be immobilized with pins while the tendon repair heals. You won't be riding quickly if that's the case. Still, the tendon won't just re-grow spontaneously if it's a severe tear; better to fix it and start the recovery process.