Struggling

I have a 3 year old and my 4 month old. Our budget requires me to make around $800/month to pay for my student loan, phone, and some groceries. I have been watching this little 18 moth old for her entire life, but my son is now being very mean to her and it is causing A LOT of stress. He is such a sweet boy but just learning to regulate his emotions. He doesn't want to share his space and his mom. So now I am looking for a different kind of gig. I have a Master's degree in special education and I can't find another way to make a small amount of money from home?! I am feeling so useless and hopeless. Any suggestions? I just applied to a nighttime coaching job, and working on some online teaching positions.