Sometimes my body suddenly feels weak, black dots infron of my eyes, cold sweat, pins and needles in my arms and legs and i feel out of breath and have to lay down i'm 21, 164cm tall, 52kg of weight, eats healthy and active. diabetes runs in the fami?

Presyncope: Is the term for almost fainting. It may be due to a range of causes. Needs a doctor examination and may need tests such as electrocardiogram (heart tracing) to sort it out. See doctor

Need evaluation : It is difficult to know what is causing you these symptoms. You will need a physical exam by a physician, and blood work to check for things such as anemia, diabetes, thyroid, lung disease, vitamin deficiency, etc