Explanation for Pain and Drainage Years After Septoplasty and Rhinoplasty?

In your case, it sounds that you may have a small infection that continues to flare up intermittently. Your best bet is to return to the rhinoplasty surgeon that performed this procedure and let him know your concerns, they may assess the wound and determine what is causing the production of this drainage and pain. It is possible that a foreign body may be irritating the deep tissues and causing this drainage. Although less common, a cartilage graft may be responsible. Your rhinoplasty surgeon will review your symptoms along with your operative note and description of the procedure to help determine the cause.
 

I am sorry you are having all these problems. You may have an exposed graft that is causing you problems that may require removal. You should see a rhinoplasty a specialist.

The clear drainage is not likely indicative of an infection but the foul smell is an indication. As long as they didn't use foreign material for the grafting, your chances are better that this is not an infection.
I would definitely have someone look at this to make sure it is not getting infected. The upper lateral graft can cause impingement of your internal nasal airway if it wasn't done in the right way. Warping can happen to anybody and any surgeon though and this is a risk with ear, or rib grafts. Septal cartilage is less likely. There is a possibility of a foreign body as well that was or wasn't meant to be in there such as suture material, guaze material etc.
In terms of bringing it on yourself, I wouldn't suggest manipulating the nose in the way that you described unless directed by your doctor. There are delicate sutures in there that manual pressure, depending on how forceful, can dislodge and create issues such as what you are describing.
I hope this helps!