I am seeing an Orthopedic specialist on Dec 23rd - so the cyst will either be drained, or removed. Oh, what fun it will be either way. If they do drain it, there is a 50% chance that it just fills up again, so they may just remove it. Or decide to leave it and show me how to work around it. It isn't fatal or malignant or anything. They're actually quite harmless except for the pain they cause. Here's a good link:
See - not so bad. Treatable. And mine is actually quite small compared to others that I've seen online.
Thanks again to everyone for your support and who've left comments and encouragement. I WILL get back to my guitar playing ASAP.