My surgeon and I came to a mutual decision that VSG was best for me at the "meet the surgeon" appointment. I'm not sure what OTN is, so I can't really answer your question for you specifically, but if you have yet to meet with the surgeon and sign the papers for the surgery, then I would wait until that appointment and revisit the issue with NSAIDS at that time.
As with RNY, the recovery time for VSG patients depends on the patient themselves. There is no standard period for recovery. I took 3 weeks before I could even walk upright, others take 2-3 days before feeling ready to return to work. It really is not predictable.
Your food plan will be exactly the same as with the RNYers, unless you have a food allergy and then there would be modifications.
Your vitamin intake will also be the same as with RNYers and you should have already been given the information sheets for both the suggested meal plans as well as required vitamins.
Good luck!