I am sorry to hear you are having a hard time. Why is it coming up now? Because it was one of the worst experience of your life. Sometimes we tuck things away in a neat little package on a back shelf, thinking they are handled. Then we find out later that all we did was ignore them and just hid them from our sight.
I have found for me the only way to overcome these things is that I must face them and get the control back. If I do not then it controls me. Maybe you can start by taking control of that elevator. You push the buttons. You decide where it goes. Own it when you get on it. When you get your control back, you will find it to be just an plain elevator. Once you get your elevator back, then try something else. Keep your goals as small as possible. Take care and let us know how you are doing.