To answer your three questions,
1. The sick leave policies varies with employers. Generally you can go for a max of six months, but without pay.
2,. Again, this depends on your employer, my employer pays 100% but many does not.
3. No employer can force you to work when you are sick, they can only deduct your salaries.
when you are sick, please take your time away from work, get well soon and come back again.