I have the same feelings about a move I made this very week...and we are closing next week.
Bottom line, we did not have to move for work or anything like that. We used to live on the river but moved 2 years ago (sept) to a house due to the fact that the other house was on a steep hill and the driveway was hard to manage in the snow. we had been there 6 years.
We found we missed being on the river. The new house had a lot of character and was very pretty and updated, had many things we never had before like an en suite.
So we found a house after a long time looking, but it is another town, another school district. Just about 3 to 4 miles from the old town, but still...another county, higher taxes, and again, different school district.
I am feeling like I made a big mistake. I should have insisted we only look for a plot of water front land to escape to. We did not find anything ideal but we could have waited. And we could not find another riverfront home in the other town in our price range as prices have skyrocketed.
I feel selfish that my son has to start anew in a new school district (starting high school in sept)
So how can I answer you? i don't know. But i think this is normal and we will survive. Regret is very common for humans, and for sensitive people even more. I miss everything, including just brief situations. I get very attached and always have. Even worse the older I get. you'd think it would get better with time!