Can I Have a Tummy Tuck with Sinus Allergies?

In general, the presence of seasonal allergies is not a contraindication to a procedure that requires general anesthesia.  You could certainly ask your surgeon or primary care physician to recommend antihistamines, decongestants, and/or other allergy medications in order to improve your symptoms.  The real concern  would be if you had a fever of greater than 101.3, signifying a true infection/sinusitis.  In that case, you might consider seeing your surgeon or primary care physician and possibly delaying the surgery. 

True seasonal allergies should not prevent you from having a tummy tuck. However, if you do experience a sinusitis with a significant temperature, then surgery should be delayed.

You noted on your labs a hemaglobin of 11.3 which is relatively low. You may want to discuss with your plastic surgeon taking some MVI and iron supplements at some point in time as this level will even go lower following your surgery.

You should not have any problems with seasonal allergies and a tummy tuck procedure. I though that the B12 shots went out in the 1960's. A healthy diet alone and exercise is all your energy level should require.
Best of luck,
peterejohnsonmd