Should i be concerned? i have moderate abdominal pain around my belly button; burning gnawing sensation, nausea, burping and bloating. its constant.

Yes, certainly: There are several possible explanations and they should be evaluated. These include GERD, appendicitis, diverticulitis , IBS and gallstones just for starters. It would be great for you to see your Primary MD who can do an initial evaluation and start the appropriate workup. in the meantime if conservative treatment is not helping we have to advise you to be seen in the ER or urgent care.