You should get counseling. You are grieving and will grieve for a while. Trying to find someone to blame is normal but you need to talk about how you feel with someone.

try sleeping in a different room, or maybe even her room for a night or two. subconciously it may help - thinking if you were closer to where she passed away - that maybe you could have gotten to her in time. Is her room still set up as hers? It may be a good idea to rdecorate the room...keep maybe only 1 small picture of her out in the living room. You don't have to forget her. nor will you...ever. but you do have to move on - greive and heal yourself. Not sleeping (this is one of my manny self isues) can wreck a body. YOU NEED YOUR SLEEP - look thru some of my questions - I asked how do I get a better nights sleep - These nice people answered with some great ideas.
Do go to a theripist, if you are able to. keep Trying new ones untill you feel comfortable talking with some one. Is your husband or significant other talking with a theripist too? Maybe you to could go together.
I am so sorry your little girl has passed away...loosing a child is not fair.you should not have to go thru this on your own. - good luck to you!

I feel like Pumpkinpie & sherry both offered the best suggestions here. I just wanted to add a little bit. While therapy & counciling can be helpful, you might also want to investigate what support groups are out there for parents who have lost their children. I think having the support & empathy of other parents who have been through this could be potentially very helpful. Also, I knew a woman who started taking art therapy courses after her child passed at the age of 2. I saw first hand how effective this mode of therapy was for her & if you have this option, I would encourage you to pursue this. Judging from your response to Pumkin's answer, it sounds like you might want to avoid alcohol & any other substances at this time unless you've been directed to take something by a doctor. Even though it was 2 years ago, it sounds as if you've been left a little traumatized by this, which is understandable. Please keep coming back here, there are a lot of really wonderful people here who are sensitive & genuine. I've left a link below for an online support community for grieving parents. I hope it helps...You have my deepest sympathy.

Forgive yourself. This was a terrible thing to have happened. There are no words to comfort, and no-one who hasn't lost a child can even start to experience what you are going through, but it was not your fault. Everyone has to sleep, and you could not function as a parent if you didn't. It is likely that you would have lost your beautiful child even if you had been wide awake, as cot death can strike at any time.

I know this doesn't make it easier for you, but until you can feel that it wasn't your fault, you will have difficulty in sleeping. Please see a counsellor, as others have suggested. You will never get over this, but you can learn to come to terms with it, and be happy for even the brief time you had her with you.

God Bless you in this very difficuly and painful time

thats sad i feel your pain