What Causes Weakness And Breathlessness While Suffering From Constant Headache?

Well I have had a headache almost everyday for a year now and sometimes there different and I had a cat scan last year and I dont know whats going on..I been to the doctor and I have other syptoms sometimes to like weak and shortness of breath sometimes my eyes will feel weird like a bunch of pressure is in them. I just want to know whats going on?