Seeing the physio or orthopod is definitely the way to go so at least you will know what you have for sure, and get specific recommendations from a local expert.
But from your biking history, it does sound like you have "patellofemoral pain syndrome".
The kneecap slides over the underlying bone (head of the femur) whenever you walk, run or pedal a bike.
Biking at high tension likely caused abnormal tracking of the patella within the groove of the femur, resulting in inflammation.
(Another common way of getting this problem is from those who mistakenly use the lower leg raise machine to try and build up their quads.)
You raise a frequently asked question of whether rehab now will lead to a quicker recovery.
The answer is that REST is the most important element in letting the inflammation subside. (Ibuprofen and ice
might help to decrease the inflammation, but realistically no one ices more than a small fraction of the day, and ibuprofen is not that great an anti-inflamatory. Cortisone, a really good anti-inflammatory, unfortunately has potenial problems with tissue degeneration and healing. Every drug and device manufacturer is trying to come up with the trillion dollar way of safely reducing inflammation, but despite all the research, there is no good, workable solution.)
The idea of "early" rehab is just to maintain range of motion so that scar tissue does not build up, and you end up with a "frozen joint". But this is just not going to happen if you are doing even a bit of walking in your every day activities. (These range of motion "exercises" are not really exercises per se, more movements of the joint through the full range of motion so scar tissue doesn't start to build up.)
After your pain has gone away, then you can start to increase your activities, to build up the lower extremity muscles that may have weakened somewhat during your "rest" to let the inflammation subside.
But as a tennis player, there is no need to curtail doing your thrower's ten:
http://www.asmi.org/SportsMed/throwing/thrower10.html
or core exercises so you are ready to go as soon as possible. (Unfortunately it is not that uncommon to suffer another injury coming back to an "unrelated" area because of decreased overall body conditioning.)
Good luck!