Black out, racing heart, face numb, tunnel vision could be signs of what?

Hard to say. Symptoms such as those asked about, when all together, may be caused by an anxiety attack. If the anxiety attack is accompanied by hyperventilation (breathing really fast or superficial), than breathing in and out of a paper bag can help shorten the episode. As always, when you have concerning symptoms, please see a medical professional in person for an evaluation.

Related Questions

Ankle surgery 3 weeks ago pain in leg opposite foot numb face numb nausea very low heart rate 60 dizzy and not feeling right. Unexplained bruises too

Clots. There is a high possibility of clots forming in your veins post surgery. This condition is referred to as Deep Vein thrombosis. There is a high risk of clots forming in your brain or lungs as well which are medical emergencies. Please visit your nearest urgent care clinic or ER as soon as possible. Read more...
Very worried. This combination of symptoms is very worrisome, especially for blood disorders such as low platelets or severe anemia. Read more...
Be seen. You certainly would want to be urgently seen to rule out a number of possible peri operative complications that can occur around the time of surgery. Read more...

18 weeks pregnant. Sudden extreme weakening & numbness on left side face & arm. No racing heart or breaths. Symptoms subsided after an hour. Anxiety?

Evaluation. I would discuss these symptoms with your doctor. My concern would be a transient ischemic attack. The mechanism, if it actually occurred, would be a paradoxical embolism from your pelvis. This requires a patent foramen ovale in your heart and be could be detected with echocardiography, which you should have. Migraine equivalent (even without headache) is another possibility. My best wishes to you. Read more...