Definately just have the leep. And after a leep you have to have a pap every three months for the next two years to make sure everything is okay.
Yes, the abnormal cells can return, but abnormal cells aren't cancer. Yes, they are pre-cancerous cells, with a leep (or the other two options to remove abnormal cells) they can remove them and it is highly likely that it wont return.
If you get a hysterectomy you then have to deal with all of the terrible side effects of that! That is a very, very drastic move and honestly it would be hard for you to find a doctor to do it just because of an abnormal pap. If it is cancer, even then it is cervical cancer, not ovarian or uteran so a hysterectomy still wouldn't be a suggestion option unless cancer had spread to those areas.
Just relax and wait for your results. A leep is an in office procedure with minimal side effects and there is a great chance your abnormal cells wont come back. A hysterectomy is very drastic and unnecessary.