Hello hun!!
I’m no professional, but here’s some advice for you which I feel would benefit you in your situation and what you’d like to do. :)
Build up a portfolio. Just slowly, maybe just one or two little sketches (digital or traditional) every day or other day. Expand your styles, try new things, experiment- just have fun and let loose. Then keep your more polished pieces in a folder somewhere which you can then show to future potential employers or commissioners.
Making jewellery/accessories! :) You can find all kinds of fun tutorials online for making nice accessories. Just think of a niche you’d like to be part of, and a style that suits your own, and save up a little money for materials to get started! When you feel confident enough to start selling your creations, my advice would be to use Storenvy as there is absolutely no charge in selling on there. :) (besides paypal fees of course). You can make your jewellery in your own time and just put them on your store whenever they’re finished.
Little artistic commissions! Make an online art gallery on websites such as DeviantArt or Anipan, and then make a post with examples of your best/most varied work stating you’re open for commissions and mentioning your expected price charge. In my experience the simpler and cheaper, the better! (When you’re first starting out). Catch on to something cute you like to draw and turn that into something people can ask for custom versions of for a small fee! To help gain exposure for your artistic services, share your page on your blogs and facebook/twitter/tumblr etc.
Make simple Flash dressup games. (This requires you have Adobe Flash, mind). Almost anyone with flash can easily make a simple drag-and-drop dressup game following a tutorial like this. Then contact dressup game sites with screenshots of your work and offering them a price (keep it reasonable, as basic dressup games are super common these days). If they ask for a sample of the game, make a 2nd version of the game file with a watermark over it to send them so they can’t have the original version until they’ve paid you. Be sure to keep a link in the game to your website/blog so more game sites can check out your work.
Think realistically. If you’re sick, you’re sick- and you can’t be expected to put in the same amount of work and energy into something as healthy people. And this means, normally, much less money for you. If you’re wanting to have a gentle little artsy job to earn a little bit of cash, good! But don’t expect it to cover your bills properly. You aren’t working 9-5 at the local supermarket every weekday; you can expect to earn around $150 at most per month when you’re first starting off. Later, your goals can grow bigger. Patience and awareness of where you stand is the key.
I hope I could help in some way. :)