More snail than hair - what happened to you sounds horrible. I'm no good at jokes but wanted to offer sympathies from somebody who has been a long time on the injury bench. I've been off running for over a year and a half with hip problems, and am likely to be off for another year or so as I wait for more surgery. You didn't say whether the arthroscopy would be to your knee or hip, but I had a hip arthroscopy at the end of December. As I said, I still can't run due to the other hip, but feel like I could with the repaired one.
Everyone is different in how they cope with a long lay-off. I am a running addict, so have found it difficult to do much cross-training. I have done some turbo-training on the bike and, more recently, have taken to aqua-jogging. That's a good laugh, especially if you do it with someone. I like to stay involved with what's going on in the local running scene, so I go to watch as many races as I can get to. I take photos and generally try to cheer on as many people as I can and, as a result, have gotten to know many more local club runners a lot better.
I hope your recovery goes smoothly and that, if you have to have surgery, it goes successfully.