Ichan, I think this is great. If commissions really cause you this much stress than it's probably for the best that you don't take them again. That or probably only take one big commission whenever you need to/have the time and charge what you actually deserve for such great pieces like that >:U
Either way, if this is what you feel is right then we support you.
And ignore those that complain that they won't get a commish - after everything, I think you should just do art you wanna do. Plus there's plenty of artists in the world to commission.
Let me know if you need any help contacting people on your behalf if the messages get overwhelming!
Oh, and do you have a list of everyone you need to do? Because I think the refs I gave you for my commission prolly won't work anymore so maybe when my turn comes, let me know so I can resend some links? I don't wanna spam you with a note right now if you're not working on it - it'll just clog more of your inbox.