How do I help my stressed boyfriend?

My boyfriend of 2 years has a very stressful job and has always worked long hours. Recently a lot of the pressure from work is coming home with him. His phone rings constantly and there simply aren't enough hours in the day for him to get the work done. I have tried to help him, get him a little better organized but my methods don't seem to suit him (he's very messy). My problem is that he has become completely demotivated in all aspects of life. He has completely lost his sex drive which is giving me a bit of a complex.....thinking that he doesn't love me anymore, I'm too fat or ugly etc. We both work and at the end of the day all he wants to do is stare at the t.v or bury himself in his phone. Meanwhile, I'm cooking dinner, doing the dishes etc etc. He doesn't lift a finger around the house and I don't know what to do. I have become a nagging girlfriend :( and I don't like who I've become. HELP?

Him not wanting you has nothing to do with you. I am a mother of an 11 months old boy. Married for almost 2 years now. I lost all my pregnancy weight, 11 kgs, soon after I gave birth. I was exercising all throughout pregnancy. I looked so good when I was pregnant and right back there 2 weeks after I gave birth. My husband gets so wrapped up in his world and work that he doesn't even see me. I thought it was me, but it is him. Some men can not get aroused if they have something on their minds. That should not let you feel bad about how you look. It speaks to your husband not to you. Don't let his behaviour change you to an insecure and angry person. I know it is easier said that done. But this is the reality of things. Some men escape their stress through sex, others just use their pcs, ipads, iphones and games to do that. You just choose the latter as a bf. Trust me, it gets even worse when you are married.