Hello,
Your not not losing the plot it's all natural feelings and I went through them last October when we left. In the final few months before we left I had serious doubts and really should of listened to my inner feelings. The morning of our flights I almost pulled out. I have two grown up sons in the Uk and miss them along with the rest of my family, friends, work, our beautiful home and the beautiful countryside along with lots more. I loved my life back home. A year later and I still feel the same. I've had many wonderful experiences and made some new friends and enjoyed my time here. In many ways it's made me a stronger person and more appreciative of what I have. Thankfully we kept our home and will return sooner or later. I wish I'd listened to myself and no one else, that's a valuable lesson I learnt. Only you can decide what to do. It's your life your decision but if you do decide not to go then you must never have any regrets. Just leave it in the past and never look back. If you do leave then embrace it with open arms and see what develops.
Good luck and be happy with your life choices.
Feel free to PM me for support