My brain cyst causes all sorts of fun stuff that mimic RA, fibro, vomiting spells, memory lapses, psychosis, blahblahblah.
Swimming at a community or gym pool is your
best bet for non-impact exercise. Activity can also help manage the pain symptoms. Overdoing it with crazy work-out routines will not only exacerbate the symptoms, but can also do more damage to your joints overtime due to inflammation (even in people without RA). Many athletes and body-builders suffer from severe knee / joint damage later in life because they didn't allow their body adequate rest. On the flip-side, being sedentary or being physically inactive is one of the worst things you can do for your body, especially if you have RA. You gotta stay moving, somehow. Stretching and non-strenuous yoga exercises are also great ideas.
A simple change you can make is increasing your water intake and making sure your body is hydrated. People underestimate the benefits of drinking more water. A personal trainer once told me, "being under just 2% of your daily water needs, your body will not only retain water but you will also retain fat as you cannot excrete it". I try to drink about sixteen 8oz glasses of water a day. If you add lemon, this can also help curb your appetite and/or aid in metabolism.
You aren't going to like this last piece of advice. I have been diagnosed with PCOS as well, and the only thing that has genuinely helped is being on a natural and healthy diet. No medications, no crazy supplements. Just building good dietary habits and consistent exercise.
When it comes to PCOS, it is all about constructing a healthy food lifestyle. You can work out all day long, but without a structured diet -- there is no point. Losing weight is roughly 70-80% diet and 20-30% exercise. To anyone suffering from autoimmune / chronic diseases, I always recommend taking a look into the "Paleo / Caveman Diet". I've lost 100lbs+ over the span of a year due to changing dietary habits and consistent exercise. Changes didn't happen over night. But if you keep at it, you will see the results without resorting to pharmaceuticals that can have some nasty side-effects.
Paleo Guide for Beginners by Nerd Fitness:
http://www.nerdfitness.com/blog/2010/10/04/the-beginners-guide-to-the-paleo-diet/
At the very least, you should start researching some non-inflammatory foods. You'd be surprised how some foods in your diet can cause inflammation in the body. For example, bananas are
very inflammatory. Alternatively, some foods / natural supplements also have anti-inflammatory properties. "DoTerra" is a great brand of essential oils. On the expensive side, but they are worth it.
As for the medical marijuana card... Discuss getting the card with your doctor / physician - especially if you are already using it to cope with the pain. If I wasn't trying to get into the medical field, I would apply for one myself since it is legalized here for medicinal purposes. God knows I've looked at the online application. I loathe the handful of meds I have to take and the toxic side-effects that come with them. However, I can sympathize with not being able to function without them.
I would suggest giving the daily lifestyle changes a try first before you get bombarded in a never-ending cycle of medication-merry-go-round and/or resorting to marijuana. Especially since most medications will, (with consistent use) over time, cause damage to your liver / kidneys -- I suggest talking about this with your doctor.
You and your ultimately doctor know your situation best. Whatever you plan on doing, I wish you the best of luck.