9 weeks post upper/lower blepharoplasty and I still have severe chemosis on one eye. Will this heal and how long will it take?

Although it can happen with any surgery around the eyes (and to any plastic surgeon for this matter), chemosis develops most commonly if lower blepharoplasty has been part of the procedure. If only the upper lids have been operated, it is very rare. If additional procedures have been performed such as canthopexy, canthoplasty or midface lift, chemosis may be more common.
Although after 9 weeks, understandably, most patients and surgeons lose their patience, chemosis will resolve. Many physicians may add steroids to the "mix" of treatments, I tend to believe that still less is more as there is no good scientific data that it actually will help the underlying condition of lymphatic drainage compromize. And any medication has their risk, too.
You are doing the right things! Stay in touch with your surgeon and we all hope for a quick resolution.

Thank you for the question. Chemosis is the swelling of the conjunctiva (the mucous covering of the eye.) It occurs on occasion with lower eyelid surgery. Treatments often tried are cold compresses, chilled artificial tears and steroid eye drops. It usually resolves within a few months. Chemosis is not a sign that the surgeon performed the operation improperly. 

Chemosis is a condition of localized swelling usually in the outer corner of the eye and is usually associated with lower blepharoplasty. Although not rare, it is not that unusual and can happen about 5 to 10% of time. Fortunately, it usually resolves in several days. The treatment initially usually consists of lubricating eyedrops and possibly steroid drops along with taping of the corner of the eye. Sometimes, the standard type of Visine can help. In rare instances, a small surgery can be performed to improve this. In general, however, one would usually wait 2 to 3 weeks as the swelling usually subsides on its own.