Feeling Tired, Reddish Eyes And Swelling In The Body. Reason?

hi am 38 years old female, i feel tired all the time, specially whenever i walk (even for very short distances). my eyes become red and face become extremely dull and dark. i feel comfort when i do not do any physical exercise/work. am comfortable in official jobs(using computer on one seat) where i have to sit in airconditioned room, there i can sit and work for long hours too, but whenever i try to do little physical work at home or shopping where i have to walk..i soon get tired. i am suffering from this problem for the last 6-7 years(or even before it). i have constipation problem also. i get swelling sometimes all over. i have taken so many treatments so far but no relief...please suggest what should i do..and the name of this problem...is it curable.