Eye Bags and Swelling 8 Months Post-Blepharoplasty

I concur with the other recommendations and highly advise you seek an additional opinion by a board certified plastic surgeon, oculoplastic surgeon, opthalmologist, ear nose and throat physician, and/or internist.
Swelling of the lower eyelids has a variety of causes and surgery is not always the answer:

This includes condition such as thyroid disease.
If the condition is caused by inflammation antiinflammatory medications and drops may be beneficial.

Surgical treatments may produce improvement but other causes should be thoroughly evaluated first. It is difficult to tell if the swelling in your lower eyelids is due to extra fat (surgically treatable) or to edema. If it is the latter you may see improvements with facial manual lymphatic drainage.

It's not unusual for patients to experience swelling following blepharoplasty surgery. In some cases, this swelling may be prolonged and take time to resolve. Although swelling is the most likely explanation for the puffiness of your lower eyelids, other explanations may also be possible. In this case, it's possible that not enough fat was removed at the time of the original procedure.Although your history is helpful, it's virtually impossible to make a specific recommendation without a physical examination or pictures. Even a physical exam might not totally clarify the issue. It's also important to rule out medical conditions, chronic irritation and allergies.In someone who's eight months post-op, it's probably reasonable to consider revisional surgery if the medical workup is negative. For this reason, it's probably reasonable to obtain a second opinion as well.

You may have swelling even after 8 months.  This is unusual but not unheard of.  These vitamins and creams you are using are ineffectual and I would skip them if I were you. 

It is possible some additional fat might need to be removed especially from your left eye.  But it is too early to make that judgment.  As long as you are making some progress, albeit modest, observation should continue. 

It is difficult from the looking up photograph to see exactly what the problem is. It appears as though there is hollowness immediately below the eyes, some retraction of the eyelids, and fullness, perhaps with irregularities from ? fat injection below that at the eye-cheek junction. It appears that your eyes are quite prominent.
Often when prominent eyes are operated on through a lower eyelid (subciliary) incision, the eyelids can pull down, as though seeking a lower position on the spherical globe (eyeball). This can present a problem visually and also functionally as the cornea becomes chronically dry.
The issue you had pointed out, however, was none of the above; rather it was the persistence of fat below the eyes. In your photo this seems to be primarily low down at the eye-cheek junction, and does not consist at all of typical lower eyelid fat that can be removed readily.
Consultations with surgeons skilled in the midface and revision lower eyelid surgery should clear this issue up further.
Although we have written many publications and chapters on your topic, we are never quick to reoperate. Any revision to lower eyelid surgery with lid retraction would typically involve midface advamcent (some type of cheeklift), plus canthopexy. Canthopexy alone can give the eye a severe look with an uptick at the corner but unaltered central roundness of the eye, a characteristic "done" look. Also, grafts such as LiveFill (nontraumatized fascial fat grafts) placed directly in regions of hollowness can help. If there is lumpiness from fat injection, this is usually removed directly.
Patients having revision lower eyelid surgery must be realistic about their outcomes, which are usually subtly better and not completely curative.

Your lower eyelids appear to be very hollow with some bits of retained fat. Like other doctors have commented, it's hard to accurately assess your situation from the one photo in the upward gaze.

The easiest and most cosmetically desirable solution is carefully placed Restylane to the lower eyelids to restore the fullness and camouflage the fat. 

Incidentally, you also seem to have a malar mount (pillow) on the right cheek which can also be camouflaged with filler.