Why Do I Have Headaches, Leg Pain, Cold And Intense Pressure?

Hello, I am 29 year old female 4 11 127 lbs. I am a non-smoker/no alcohol. I was diagnosed with graves disease in 2002, but my thyroid levels have balanced out and and I am no longer taking PCU. I have been suffering from leg pain mainly right leg, but will sometimes switch to left leg or both at the same time. The leg pain usually occurs out of no where, the cold only makes it worst. The pain is often so painful that it is unbearable to walk. I remember have this leg pain as far back as 7yrs old. I also have severe headaches that are sharp throbbing pains, or what feels like intense pressure. I have recently begun experiencing mild chest tighening and what feels like a heavyness in my chest. I have been checked for PAD, had MRI s, EKG s,CAT scans all back negative. Please help as I am worried if I will be able to care for my children, as the symptoms appear to get worst as I get older. Thank you