Where do I go from here?

So I have two kids but I’m extremely tired to the point it cuts into everything I do. I’m only 24 and I feel like I just can’t function like everyone else and it makes me feel lazy. I get to where I could just fall asleep throughout the day and I did wreck one car. I’m crying constantly because I cannot function with how tired I am for my age. I went to the dr and all he did was prescribe me medicine to sleep better throughout the night. Where do I go from here? Because my friend who has five kids is in better mood/energy levels than I am day to day. I just don’t feel like this can be normal