Eeep! No medical insurance... Ack. And yes, an MRI is really expensive. I've had loads of them but I've always been covered by insurance

Here is a quick tendonitis overview from WebMD: http://my.webmd.com/content/article/78/95608.htm?lastselectedguid={5FE84E90-BC77-4056-A91C-9531713CA348}

Not sure if that is what it is, but it doesn't hurt to stay with the ibuprofin and start icing.

A few other things to consider:

1. Don't wear high heels. They throw your entire leg out of whack and will only hurt your knee more

2. Stay off your leg and try to keep it elevated...

Hope it gets better!