Depression. Irritated. what should i do!

I had to quit my government job recently as I had no support from family to take care of my 3 year old twins. Although I want the best for my kids but as I have always been very competitive and career oriented, I regret my decision of quitting my job as I was being paid well and had an option for pension also. Anyways I decided to restructure my career as a teacher( which is totally different from my earlier job profile) but as I can't cope with going to college regularly due to the responsibility of the kids, I have to do all household work + studies making files etc on my own and due to the constant pressure of household work+ studies+ pressure of structuring a new career I always feel irritated and angry and sleepy and don't feel like doing anything most of the time. I hate everyone around me as I think no one supports me and specially whenever someone tells me that I my decision of quitting my job was wrong I feel all the more depressed and irritated. What should I do