Your lecturer is more than happy to answer your questions - they also have consultation hours listed on their doors and on this Web page. You may particularly want to approach your lecturer if you have problems with the concepts presented in a lecture. If something major goes wrong, and you need to be absent for more than a couple of days, inform your lecturer or your tutor. If the matter is serious enough you should apply for special consideration at your Faculty office. We hope that you will learn a lot in this subject.
Mathematics can be difficult.
It can also be enjoyable if you work hard at it.