Older than dirt
Join Date: May 2008
Location: Winchester, VA
Bikes: Too darn many.. latest count is 11
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Give it some rest. Then get back into it gently. I did a 90 miler the Sat before New Years, and was about crying the last 5 miles it hurt so bad. I bike commute 15 miles each way also, so the first Monday back after New Years I was thinking it was going to repeat about 10 miles in.
For me it's the left knee, but I decided to put a sports brace on it and keep going, albeit at a low, low pace - all spin and no load. Seems to be doing much, much better now. Still not 100% though. Like you, no previous history. I've slowly been able to pick up the pace since then, but still off my normal. To give you an idea, "normal" on my commute is 55mins to 1 hour, right now running at a 1 hour 15 min pace.
And Advil is your friend :-)
Beyond that find a Dr that is savvy with Sports medicine. It's a repetitive motion issue that may be flaring an existing problem. It could also be a bike fit issue.