Husband who is always gone.

My husband got a new sales territory last year. He’s home for two weeks, then gone for one. I’m in full time college, have an almost 7 year old and an almost 2 year old. I hate this. I find myself lashing out at my kids out of frustration and stress. I have little to no help, just grandparents who take the kids occasionally, but that is usually for date nights. I’m constantly wondering what my husband is doing on his trips and worry about unfaithfulness due to a series of events that happened prior to this new sales territory. I don’t know what I’m looking for here, maybe shared understanding. I’m not sure.. all I know is that I don’t want to take this away from my husband who’s worked hard to get a bigger territory, especially with him being the only one working while I attend school. I’m just not sure how to survive a life like this. I hate when he leaves. My children hate when he leaves. This just sucks.