Swollen neck, underarms, groin lymph nodes, cbc normal, have diabetes and gastroparesis, stomach very tender?

Many possibilities: Some causes of swelling can include systemic problems such as hypertension, and problems with the kidneys and localized issues such as arthritis, infection, lymphatic obstruction, blood clots, varicose veins, trauma (fracture, sprain, tendonitis) and side effects to medication. Have it evaluated by a professional and get the appropriate treatment.