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Since it is associated with vomiting, the lump could be distended stomach, trapped loops of intestine or epigastric hernia. There could be obstruction to the small bowel. Please consult a doctor ASAP or go to the ER since the lump is getting larger and vomiting is worsening. It could also be gastroparesis or slowing of the stomach movement. It would be ideal if a gastroenterologist can see you soon.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
You didnt mention this in your post in the anxiety forum.... Have you never seen a Dr. about any of this? Let them do a little x-ray or ultra sound on your stomach to see what could be wrong with your stomach. It could be hernia... or something. Set up a Dr's appt. very soon I would advise. Does your family know about this at all?