After 8 weeks abortion how many days bleeding occur ?
If it continue till 2 months or more than , this period is very long and heamoglobin may be low so is there any solution for that ?

You MUST go to a doctor. There's no way to know if this will stop on it's own or if there was a perforation of the uterus during the procedure, or what.
Take a multi-vitamin with iron, drink enough fluids, and eat a healthy diet of dark green vegetables and lean protein for your hemoglobin.

Why abdominal swelling occur after abortion ?
When it will get normal ?

What country are you in? Is it that difficult to see your doctor? Was the abortion done by someone with no medical degree? Was a D&C done? How pregnant were you? Do you have a fever?
All the more reason to go see a doctor, even if not your family one. They have to be discreet and keep your condition private. Swelling can mean many things too, from gas to internal bleeding.

I aborted 8 weeks baby in hospital only , before 2 months this was done .
But after that bleeding not stop yet and swelling also I feel so what this situation.
Is there any dangerous thing going to happen soon with my uterus or any other risk ?

You aren't reading my answers carefully, and you haven't answered all my questions, especially 'do you have a fever.'
We can't know which one of many possible reasons you have bleeding and swelling. Therefore you must see a doctor. Can't you at least CALL the hospital?