Just want to add to the list of people assuring you that everything you are feeling is completely normal. My mom was the only other person home the morning my visa arrived. After ripping open the package and seeing that I had been approved, we both jumped around my room doing a happy dance then promptly both broke down sobbing. It's a lot of emotions for one time. I am so thankful that my parents, though very sad that I was moving, were supportive of my decision to move. And I said the same thing to my husband- if I am moving to your country, you had better at least be equally willing to move to mine! Regardless of whether or not it happens, the willingness works both ways!
I have now been here for 2 1/4 years, though I had lived in the UK for a bit on different visas before moving here permanently. There are still things I miss but I have found things I really like in the UK. I talk to my parents everyday through a combination of WhatsApp, Snapchat, Skype, and the O2 calling plan I have. In that regard, it's no different than how they contact my brother who lives in Baltimore (the 'rents are in NE Ohio). It just stinks that it is so expensive to visit them and requires a solid chunk of time (thank goodness for 30 days of annual leave!). I certainly would not have been able to move over here if we weren't living in the technological age. I honestly would be ambivalent about returning to the US if it weren't for my family. We do live conveniently close to Canada, though...
KFdancer, I am in the same boat! This is 'birthday week' in my family. My brother's was Monday, my mom's was yesterday, and mine is tomorrow, then my dad's is in 12 days (my sister's is in August, but only after a successive string of our cousin's, grandfather's, and other grandfather's). I am always so homesick this week because it is such a big deal in my family and we have our traditions. I adore my in-laws and they are so kind to make my birthday a big deal (they're taking us to the movies and out for ice cream tomorrow) but it's just not quite the same if I can't drink out of the birthday cup and eat my favorite meal as prepared by my mom. But there have been some highlights from this week. My mom sent me Happy Birthday socks to wear tomorrow! And I came home from work yesterday and Skyped my mom for three hours. Really happy that I am planning to go home for our birthdays (thank you, Easter Bank Holidays!) next year.
Sorry for the rant but this topic has hit a bit close to home tonight. You will have a bit of an emotional roller coaster in the upcoming months. Let yourself feel it. Make plans for yourself when you get over there. Give yourself something to look forward to. Throw yourself into wedding planning. Will your mom be coming over in October for your wedding? If you're moving in July then it won't be very long until your first visit!