I'm 15 and 5'5, I have always used super grips and I have a size 3 but they sell up to size 5.
http://www.gymsupply.com/supergripwhookandloop.aspx
These are the ones that I have.
I just got one from floor express music and it was $150 but very good quality and I'll be using it for at least 2 years so I think it'll be worth it. And I love how it came out.
I'm in the same boat and my coaches are very careful with what I can and cannot do because the boot throws off your balance completely. Also be careful not to smack your shins on the bar
Possibly a cyst. I had one in my elbow and it felt kind of similar to how you described it. I had two misdiagnoses before I had an MRI and they found it. I also lost most of my range of motion. After physical therapy it was fine.