Sorry to see this Leon but the upside is that this is fixable but that doesn't fix the punch in the gut of surgery and I know first hand how macular degeneration can play with your mind. Easy for me to say, because it is not me, but I am going long on the positive here because they've found the problem and it can be fixed.
When you get to feeling low, and thankfully Wednesday is not far off, just focus on the visual of you and loved ones in the Bahamas, hanging at YOUR place, the place you always wanted. The surgery is going to fix that and you will get to see that.
Several years ago, I had a friend going through some really rough times. I was at a loss on how to help her and used that throwaway phrase "just keep your chin up". She snapped at me "what the hell does that mean. If I could do that, don't you think I would be doing that"? I was taken back, not usually an easy thing to do, and started to think about it and decided I had to help lift her chin up so we began to discuss all the things that were not circling the drain in her life and before we knew it, her mood was beginning to lighten. That did not fix the problem and was only a Band-Aid that would nee to be re-applied every time it fell off but it did help her to change her focus.
ABQ is right, this too shall pass but that doesn't help a man in a minivan with four 4 year olds on a 4 hour drive. It will pass in 4 hours but those 4 hours can seem like an eternity. We all need help with that chin up and I also know first hand about that because I didn't think I needed any and my chin was on my chest.
So, my man, consider this your chin up. You + family/friends + Bahamas = Happy. And visualization works, I know this first hand as well. I use it all the time as an anti-depressant.