Here are a few that are listed for treatment of anxiety. I like Kali Mist myself even though it is not listed where I found the strains below. A good number of those below are not what in the 60's and 70's we called "giggle weed" but if you want help with anxiety this is a start and if you want to laugh it might better be found in strains that are not the best for anxiety sufferers.
(Trainwreck) Anxiety, arthritis, diabetic neuropathy, depression
(Northern Lights) Anxiety, radiculopathy, insomnia
(LSD) Nausea, anxiety, depression, headache
(Jack Herer) Anxiety, fibromyalgia
(Firecracker) Anxiety, depression, nausea
(Fieldale Haze) Anxiety, back pain
(Burmese kush) Anxiety, depression
(Blue Moonshine) Anxiety, depression, insomnia
(Big Bang) Used to sedate and relieve stress & anxiety amongst sufferers of severe anxiety,etc
(Romulan, NL#5, Hindu Kush, OG Kush, Bubba Kush) Social Anxiety