Sorry but in Colorado they will not except anxiety, depression as a reason for a card.
The current stats are:

Cachexia
414
2%

Cancer
492
3%

Glaucoma
188
1%

HIV/AIDS
192
1%

Muscle Spasms
5,273
30%

Seizures
482
3%

Severe Pain
15,654
90%

Severe Nausea
3,612
21%

You can find this info at Colorado: Department of Public Health and Environment, Colorado Medical Marijuana Registry