Help me, please!!!Calf Pain

Hello guys, i really need your professional advice. From since last week I began having pain in my right calf, its very excruciating pain, and i wish it on no one. Whenever i try to bend over to pickup something, i cannot. I need to bend with my knees to pick up something, if i just bend over, i feel the terrible pain. I had absolutely no back pain, since i had the pain in my calf from last week.But last night, i got up off my bed, and suddenly felt a terrible shock in my calf, and so i fell on the ground.When i tried to get up, i couldn't,i was on the ground for over an hour, and couldn't call the ambulance nor ask for help, because whenever i tried to, my right calf hurts badly. But i tried and tried and while getting up, i suddenly felt this pain in my calf, that went all the way to my lower back, and now, my lower back as well, is in pain. i cant sit down without being in pain, or stand up too long, because my right calf and my lower back is hurting badly.

Let me summarize it in details:

-Terrible pain in right calf area
-Now Terrible pain in lower back
-Cannot bend over
-Must hold on to something, inorder to get up out of the bed, because my right calf hurts badly
-When did i started to feel the lower back pain?: Fell on the ground, tried to get up, but i felt a terrible pain in my calf that went all the way to my back
-If I sit down too long, my back starts to hurt, and then i must getup

I believe that my weight has something to do with it as well. Im 5'11, and weigh 310 lbs.The lower right calf pain began when i went out with a friend and walk over a mile and a half, and since then it got worse.

Thanks for reading.