What are the symptoms of anemia?

So lately I feel colder much more easily, for example I'm in a room with friends and I seem to be the only one who is cold , and my hands the majority of the time feel cold, I get tired easily, like waking up the stairs makes me out of breath, or walking a little bit in school makes me feel tired. Also this has happened a couple of times, I get up and I feel ringing in my ears and everything goes black for like a second then I feel fine and don't faint or anything. Then today for about 30 mins my left arm literary felt dead and heavy. Everytime I tried to life it up or do anything with it it just felt strained . I told my mom today about it and she said I could have anemia (not enough blood) I am 14 years old, so yeah could you guys tell me what this might be