What worked well for me with Wheeler, was to have him sit/stay when he was behaving insecurely. I didn't talk to him, pet him or otherwise give him any attention. We just stayed where we were until he relaxed. Then I praised, treated and we went on about our business. This stage passed fairly quickly with no lasting issues.
AKC GCH/UKC CH Lyndobe's Wheel of Fortune, "Wheeler"
AKC Ptd Lyndobe's Loquacious Charm, "Lola"
Windsong's Fame N Fortune v Shelian, "Fame"