Suggest Treatment For Painful Knee Swelling

I hyperextended my knee while working out about 3 weeks ago. It swells so that I cannot straighten it - occasional pain -swelling goes down in the mornings but comes back within 1 hour of getting up. I have an old anterior cruc. lig tear that I had a scope on about 20 years ago in that knee. Should I see a doctor or a ortho specialist or wait to see if it goes away?