Do I really have a strong immune system?

My mom said I got her immunity from when I was born, so I have a strong immune system like her. If that is true, why am I getting upset stomachs and shortness of breath and pain when swallowing, headaches and painful spots on my toungue. I'm really hypochondratic so can this just be anxiety and my braces that cause the pain on my toungue? Or could it be a virus because viruses are strong enough to break down a good immune system and cause these symptoms?