Quick Weight Loss

I admit I am so alarmed by the recent feeling I am having towards my health and I am scared. I am just 29 turning 30 this May but I feel old and tired fast. Got the feeling rheumatism in my hands and knees, gets tiresome easily and is having a swollen feet till knee high edema due to prolonged sitting. Some says I need to do this check up, this and that, maybe you have a heart, kidney or liver failure waaaaaaaaa do they think they are of help by making me scared? all I want to do is to loose weight but is there really a quick weight loss program? I need to lose 120lbs soon.