Coping with being a single parent

Sarah • Proud mum to 2
Lately I've been at my wits end and am having a really hard time coping with being a single parent. When my ex and I split last summer I had no choice but to move in with my parents. I thought it would be fine and I would have a lot of help when needed. There are 3 other people living in this house and I have absolutely zero help with my very busy 11 month old. I can't even ask them to watch him while I have a shower without them making a huge deal like its the end of the world. Not only am I a single parent but I'm also a college student. I'm trying to better my life for my son and I rarely get to study because once again...no one will give me a couple hours to myself to study.  These past few days I've had a horrible head cold and I have two exams today. I've been trying to do it all by myself and I'm almost at my breaking point.  I can't afford a babysitter or daycare and my ex is only allowed supervised visitation. My mom watches him while I go to school a couple times a a week and even then she makes a big deal about it and makes me feel bad. Idk what to do anymore. Anyone else in the same boat? How do you cope? 
Update: just wanted to add that I'm not meaning to sound "woe is me" or "poor poor me" I'm not looking for sympathy. Just advice! :)