From the photo you appear to be a good candidate for a tummy tuck with repair of the hernia and the diastasis. Dealing with the navel can be tricky when combining hernia repair with TT, and do discuss the options with your surgeon. It is quite common to combine these procedures, though there are times the the hernia would be dealt with at a separate operation.
When you ready for an in person consultation, RealSelf has listings of surgeons in your area. You should consider cross referencing the listings from the The American Society of Plastic Surgeons (plasticsurgery dot org). A listing in the ASPS website assures you that your surgeon is not only board certified, but also is a member in good standing of the major plastic surgery organization in the U. S.
Thank you for your question, best wishes.