Wow, sounds familiar! My husband was ALWAYS on the computer, night and day. Gaming, paying bills, for work, boards, and on and on. It was always a good reason, he really liked the paying bills one! I had envisioned myself putting a hammer through it at times! It was a huge source for many fights/heated agruments.
He always said, it could be much worse, as in he could be out with friends till all hours of the night. He always debated just how much he was on the computer. And on and on. Sadly I think he changed because I would pretty much never sleep with him because why would I want to. Not alot of intimacy in watching him on the computer! By no means am I suggesting using sex as a weapon, I'm just telling about my experience!
Nevertheless, I don't know if I finally got through to him or what. He isn't on it nearly as much.
I know how you feel, like your invisible. It makes you feel like you don't matter. That he isn't interested in what you have to say or how you've been feeling today. I completely understand.
I guess men use it has an escape. The key is moderation. Basically what we worked out is sit and talk once the kids are in bed for 15-20 min. Then do your own thing. He goes on the computer and I have a bath.
Well, I don't know if that was all way too much more information than you were looking for. But I just wanted to convey is I know how you feel and you have the right to be upset and now you just need to make a plan so anyone feels like their needs are being met.
Cheer up! :)