I am a ATC (Certified Athletic Trainer)and deal with sport-related injuries on a day-to-day basis. However, I do not have a lot of experience w/ the particular procedure you had, but I will give you my professional opinion. As you probably already know, your impatience may have bought you another surgery. MD's go to school to be experts in a field.
And you my unfortunate friend, are no expert at 20 y.o.
For the immediate time being, I would stay off of the knee (minimal walking, no exercises except for therapy, no running or lifting with that leg). Plenty of ice for 20 minutes as often throughout the day as needed and maybe some Anti-inflammatories (ie. Ibuprofren, Aleve, Motrin).
You can take as much as 3 200MG tablets 3 x's a day of regulart IB or try 2 Aleve in the am and two in the pm.
As for what might be occurring with the knee, you have probably further damaged the area that the DR. tried to fix. Cartilage is not like bone in that the more weight-bearing activites (ie walking, running, lifting) you do, bone will get stronger and grow in density. Cartilage does not respond in the same way.
By doing more activites such as running, you have slowed the healing process or have completely disrupted the whole thing.
If this pain continues for more than 7-10 days after minimizing your activites, I would return to the Ortho. who performed the procedure and get his professional opinion. Expect him to be pissed. Most Ortho's don't like it when you F--K Up their work, but they do appreciate the money you will be paying him or her to correct your screw up.
Good Luck kid!! Keep me posted on how this turns out.