Angry and hurting

I feel emotionally crappy tonight. I feel like crying. I just feel so sad. I can't think very much - all I can do is feel.
I'm hurting inside. At the moment I just want support - someone to listen to me and I feel like I don't have that. It hurts. I am there for SO many people. I listen to them, encourage them, I give feedback, and I do everything in my power to help them and empathize with them. But when I need someone - nobody is around and nobody seems to care. I can scream I need support from the roof tops and suddenly it seems that nobody in the world exists - they all simply vanish from my life until they need me.
I feel like lashing out on people next time they come to me for support. Telling them I'm done and that I can't take the constant bitching and wanting of my support when I get no acknowledgement in return. I'm hurting too ! I'm hurting and I am STILL there for them, why can't they be there for me as well? I understand they may be hurting but can't they just put aside how they feel for a little while - just as I constantly do for them?!
I know I have Justin and I love him to death and he would listen to me, but I know he doesn't know what to say and I know that all I would do is hurt him as well and I don't want to make him feel bad and down low before the baby comes. I need him to remain positive and happy for when baby gets here because I'm unsure if I'll be able to play that role.