Hollow strap on for trouble keeping erection?

I suffer with anxiety, which sadly can follow me to the bedroom. WIth slidenafil my performance is good, however I rarely keep an erection long without it. Has anyone had any luck with a hollow strap on, I figure it'd take the pressure off of me and help me stop worrying. Do they offer any sensation for the man?
Thanks in advance for any suggestions, either about the strap on, or any other ideas.