I need advise, please!!!

Hello ladies I need advise. My husband and I have only been married for almost 4 months. But I feel like are marriage is going downhill ; ( I'm 25 he is 29 and he works out of town. He only comes home on the weekends. And I feel like that long distance relationship is pulling us apart. I am currently going through a very stressful phase of my life and I feel like I need him, but he is never here. I take care of my sister whose is in a vegetable condition and her 2 children. I love him so much but I feel like I resent him for not being here at times. Am I been selfish? What should I do?

Please help I don't have any close friends or family to ask advise