Don't worry it's perfectly normal
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I did the same as you thirteen years ago, with two kids, nowhere to live (but I did bring my tent with me!!), no Spanish language, no schooling, no friends
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, and everyone thought I was completely nuts to be moving!!!!!!!
Perhaps I was, but I moved from UK for the same reason, to give the kids a better life, and I have never, ever regretted it! My kids may not appreciate it but they
have had a better life than I could have provided them with in UK.
You'll be fine I'm sure, the last few weeks leading up to the great adventure are the absolute worse, but once you are there I'm sure it'll all fall into place!!!!!!!! And even if it doesn't, you will at least be able to say you had the guts to try it!!!!!!!!!!!!
Good luck