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  I'm unsure of what to say but is there a way where he can be there with you but NOT see you ?? 
 He'd calm down if he couldn't I bet...My girls are the same way and it's my fault for being with them so much ...but once I'm out of site completely they calm down and just wait for me.....poor baby...he does look like he's trying really hard to get out
 
 that's why groomers dont want people being there when their pets are being done - if your pet can actually see you it adds to their stress and they think of only trying to get to you.  If  you're out of site...he won't have anything to strive for and maybe will relax
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