I was told i have 100% blockage in my celiac artery. should i worry?

Depends: Celiac artery is one the major arterial supply to the gastrointestinal tract mainly liver, spleen and stomach. There is typically extensive collateral circulation/connections between the celiac and the other arteries like the sma(superior mesenteric artery). If you have no abdominal pain and the occlusion was found incidentally then no worries , otherwise check with your doctor/surgeon.

Only if symptomatic: There must have been some reason for the evaluation that led to the finding of celiac artery blockage. If these were symptoms of pain in the abdomen after eating, associated with weight loss, etc. Then there is reason to pursue this, visiting a vascular surgeon who can advise you.

Not necessarily. : Chronic mesenteric ischemia is a condition where the "guts" do not have enough circulation in order to digest food properly. This causes pain after eating and can lead to weight loss. It can be a very serious condition that can require a procedure or surgery. However, the body is amazingly redundant. Most people have to experience complete or near complete blockage in two of the three main arteries to experience these symptoms.