Can I have more children if I have endometriosis?

Yes. Endometriosis is associated with infertility, although not considered a direct cause by its presence. The long term effects of endometriosis can cause infertility by adhesions and scarring of the tubes. If you had problems conceiving before, you may or may not them this time. The only true way to determine if conception is possible is to try.
Yes. Endometriosis can cause pain, but it usually does not interfere with your becoming pregnant.