What Causes Lightheadedness, Hot And Cold Flashes And Headaches?

What do u think this could be? i am a 20 year old female, and ive been experiencing for the past four years the following symptoms light headed headaches short of breath tingeling and numbness in my arms, fingers, feet and legs chest pain hot and cold flashes The doctors have been trying to figure out what’s causing this but there having no luck, I am currently going for tests for my lungs heart, and brain, as well as a bunch of blood work. During the past four years tests have come back fine until now. Recently tests have come back with I might have lupus because of blood work and my mri results showed I have a lesion on the back of my brain they think I might have ms. Is there any way that you might be able to help me try and figure out what’s causing this please and thank you