NGUG - the MRI machines can appear claustrophobic, but they give you headphones and nice music to listen to anyway. Your job is just to lie completely still. Shit your eyes and take some rest - it can be enjoyable.
As for keyhole surgery (IF you do need it) - I had a meniscus op on my right knee a few years ago (after a volleyball accident!). Three hours after the op, I walked out of the hospital under my own steam, just using crutches. I think after less than a week I was walking almost normally and after 3 weeks doing light running.
All I'd say is, there's no point fretting about it and getting worked up. Such feelings will only slow down your recovery anyway. I always set about trying to make hospital staff laugh, because they must have to deal with a lot of misery on a regular basis. By focusing on their needs, I seem to bypass any concerns/ self-worries and it all goes along much better. Keep us posted hey.

Oh yes, lovely 8km recovery run at lunchtime. 31C here. Sweated loads but was going very slow. Unusually, I felt more energetic when I got back to work.