OP, it is great that you are recognizing how you are doing. Personally, I feel bad that you were dumped off after 3-4 weeks of "off and on" orientation. In my experience, successful precepting of new ED nurses has involved 1:1 orientation for at least 6 weeks using ENA orientation materials and close guidance. Since this is not the case for you, here is what I would do if I were you.
1. Get online to www.ena.org
and find their online orientation program. If your employer will not supply this for you, join the ENA (to lower the cost of their products) and buy it for yourself. You may be able to convince your employer to help you with this. Study, study, study. Knowledge will help you feel more confident. You're obviously going to have to be self-directed in your learning from now on.
2. Continue, as you have been, to ask your co-workers about things you are unsure of. When a new co-worker asks me a question, I have never felt that I wasted my time sharing knowledge or skills.
3. Use your downtime at work (if you have any) to get into your rooms or the trauma/resus rooms and learn all the stuff that is there. Do the same thing for infant warmers/bassinets, rarely used equipment, etc. You will be surprised to know that many of your coworkers are unsure about these things as well and you will have a short little inservice right there in the trauma room. If you don't know how it works, open it up and look at it and get someone to show you, or read the directions. You will get more help from your coworkers if they see you are serious about learning. And the next time some doc calls for that whatever thing, you may be the only one around that knows how to use it.
Stay strong, and become the ED teacher that you needed. And remember how it was for you, and pass it on. You will become that person sooner than you think.