Everything you need to know is here:
http://public.health.oregon.gov/DiseasesConditions/ChronicDisease/MedicalMarijuanaProgram/Pages/index.aspx
Somewhere on that site is a list of the conditions that are approved, some of them are broad enough that your condition(s) might fall under them.
As I understand it at this point only Medical folks can buy edibles, because the OLLC hasn't figured out how to regulate edibles dosage yet. Should happen this year I think. In the mean time you could (as a Rec person) make your own after buying (or growing) buds.
My wife has RA, she had no problem getting her card. We used one of the many "clinics" that help facilitate. Her employment provides medical coverage through Kaiser, and they won't submit applications for medical cards, but they did send her records to a clinic (at her request) with a doctor on staff who reviewed them and submitted them. I think the clinic gets $200 for that service and submitting the paperwork (plus you pay the state for their part, another $200). You can also submit the paperwork yourself, if you have a doctor who will sign off on it. It's all kind of odd if you ask me, but once you're in its worth it.