ghoory

I had a question regarding how to ask for LOR of recommendation from professors I have already asked before. I applied for phD programs in 2011. I did not get into any of the schools I applied. I was very upset at the time and didn't let my recommenders know about the outcome and have not been in touch with them. Since then, I moved to Europe and started doing research in a bit of different field. Now my supervisor is retiring and he suggested me to apply for a few programs in Europe and US. So I have one reference from him, but I will need more. I have no choice but to ask the same professors again. I don't know how to ask them again and I find the situation awkward because I have to contact them again after 3 years and it has been since 2009 since I got my Masters. Can anyone suggest how should I email them asking them again for new LOR after such long time. I feel very embarrassed and awkward asking for LORs, and especially in a situation that I didn't have proper contact with the professors, so any advise is appreciated. Thanks Sharon