I'm sorry to hear about your bad luck Tim, don't despair!
I also have mixed results for my first year but if that helps, I try to keep thinking I'm happy I managed to grow anything at all :-)
You tried an impressive amount of different vegs so you'll have learnt a lot from this year that you can apply for the next one!
I tried to keep notes of what I could improve or stop for next year - so much to do because I did loads wrong!
- I sowed far too many tomatoes for my space so I had to give plenty of plants away. I then didn't harden them off properly, they had too much wind during the day and many wilted, so I ended up loosing the plants I had kept. I had to take some back from my friends
(oh, and also my next door neighbours 'barbecued' them one day, because they had their grill so close to my plants!! That can't have helped).
- I had my radishes eaten by a caterpillar. At first I thought it was bird damage so I put a net on (I felt really stupid the day when I found the fat caterpillar who had quietly eaten all the leaves in total safety behind the net).
- My courgette also has its older leaves yellowing; I think it's mostly the wind?...They still produce delicious (though little, but I don't really care about the yield) courgettes so maybe don't despair!
- I had 3 strawberry plants...and 3 strawberries in total so far. Unsatisfactory. One plant was eaten by vine weevils that climbed to my 2nd floor (...or were there from the start), one kept producing runners but no fruit. It's so pathetic that it makes me laugh. But at least now I know what vine weevils look like so they'd better watch their backs next year (they seem to love wild strawberries more than anything so I keep a pot of that, as a lure, and when it gets dark I take this pot in and pick the culprits. It my revenge).
So look forward to next year to apply this year's learnings!
Good luck :-)