Do i have stomach cancer, vomiting, hot and cold sweats, nausea, severe pain in upper quad, bloods clear, xray and ultrasound also show nothing?

Probably not: Pain, penetrating or none, weight loss poor appetite blood tests and plain x-rays do not identify. Upper GI endoscopy, barium swallow, ct scans can be helpful with difficult diagnosis. Some lymphomas can have fever, night sweats, .

Upper abdomen: It is unlikely at 25 yo you have gastric (stomach) cancer; however, the symptoms you describe are serious and are most likely manifestations of something else in either your stomach (?Ulcer, gastritis), pancreas, or gallbladder/liver. An upper endoscopy is probably warranted to further define the problem. Seek medical attention.