Nana23boys, I've been on both sides of the coin. We left the UK many years ago when our children were both very young. They were my parents only GCs, and, of course, they were heartbroken, and so were we when it came to the time to leave. However, they wished us well, and told us to go and have a wonderful life. They visited us as often as they could afford it, and made some wonderful memories for us all. This was in the days before Skype/FaceTime, and cheap phone calls, but we all managed to survive, and my kids still had a close relationship with my parents, and never lost that special bond. We survived!
Several years on, and my DS & DiL moved to another country with their jobs, where they had our two GCs. Thankfully, we weren't too far away, so we were able to visit them fairly regularly. Our DD returned to the UK some years ago for university, and decided to stay there. So, we were here all alone again, until DS & DiL got new jobs, and returned to live here with our GCs about 18 months ago, which has been wonderful. However, my DH is soon to be retiring, so we're moving back to the UK, and we'll have to leave them all behind again! Frankly, whilst I'm looking forward to DH being retired, and the next chapter in our lives, I'm already gutted at the prospect of leaving them all behind, so I do know exactly how your feel, and there are many other GPs here on Gransnet who are in exactly the same position. It's hard, it's upsetting, but they all learn to cope with the distance from loved ones. I've done it before, so I know I can do it again, and so will you.
As others have mentioned, I know the fear of flying is real, but there are courses out there that can help people to over come this fear, and even hypnotherapy is worth a try. I hope you consider getting help, as would be a shame to miss out on potential visits to see your family, and make lovely memories. All the best to you.