I've been injecting insulin with the Flex Pens for 9 years and I just inject right through shirt sort of just under the table at a restaurant. No need to go to bathroom. If you use vials then harder to do in public though I've seen that too. The Flex Pens are super convenient but more expensive too. But inject right through your shirt/blouse. Easy. The time change will take about 2 days to adjust to. No prob. I do European travel a lot. No big.
I don't think your post is very helpful and I fear for your future. I few years ago, I was going through a bout of depression. I stopped taking ALL my meds and convinced myself that I felt batter and was losing weight. What I didn't realise was that I was basing this on how I felt and other external factors. The internal factors were my blood glucose levels were sky high at 28.something. Believe me, you are not given medication for any other reason than you need it. I am now on Humalin I morning and night. I am not perfect but in a much better place than I was. Still struggle with depression but still alive and kicking.