Try not to beat yourself up about it. I'm sure all those people you've spoken to have had their "off days" too. At least you called them and made the effort. A lot of people avoid making contact in such a direct manner.
I've had some terrible conversations on the phone with people, and in person too. It doesn't really matter. It's soon forgotten. It's not recorded for posterity, thankfully.
When you're having a better day and feel more positive, why not try calling them again?