Hi I Have Been Getting Migraine Type Head Pain When

hi i have been getting migraine type head pain when i walk more than 50ft. it's like i'm out of breath which brings on the pain. i have to sit down for 5-10 min before i can even think of moving again. i have never had migraines or any type of pain like this before these past 3 weeks. no change in my eating habits or emotional. i can't go shopping or work. at home is the same, if i walk around doing house work i get the same headache. it's getting worst as the days go on. what could be wrong. thanks for your help