You are probably 5 or more pounds overweight. Calf strains are common to runners in their 30s or older. I had my share in past. I used calf sleeves, had deep massage, used lots of ice, lots of stretching and more. All that helps. Sometimes you can train through these calf issues. Most often they restrict any quality training. A ruptured calf sounds like you have several deep muscle fiber tears. Two things) 1: Do not run. Ride a Life Cycle to maintain anerobic and aerobic fitness and leg strength. 2: Weigh yourself then really cut the calories and loose 5 to 10 pounds.
I had various calf strains on both legs when I was in my mid 30s into my late 40s. They usually came on when my training increased as well as my weight going up. Unless you train at or above 80 miles per week, you can't burn more calories training then you take in. When I lost 20 pounds and dropped closer to my college weight, my calf muscle injures dissappeared. That was 9 years ago. Unfortunately, other injuries come and go as get older.