Anxiety, stress, weight gain..

Hi. I am posting for support. And any advice given is greatly appreciated, so I thank you so much in advance. I am 27, pregnant with my second child. It's a boy. I have an (almost) 5 year old daughter, Fallon. My husband is in the Navy, and has a lot of duty days and sometimes duty weekends. Which means, he stays the night in the ship on those "duty days" and an ENTIRE weekend on the "duty weekends." I know it doesn't seem like a lot of time away from him, and it isn't, compared to the 9 month deployment we just recently went through..but it's still tough. Which explains my anxiety. I think. I know he's coming home after those duty days, but I just feel so anxious until he's actually physically home. In the flesh, ya know? The stress part comes from, well..I'm due Aug. 25th. The day his ship is supposed to pull out of the yards and travel back to Va (possibly with him on it) is, GET THIS, Aug. 25th! 0_o So in August alone, I have to put a 5 year old in kindergarten (I am SO not ready for that) Find a decent school, apartment/home in Virginia. Do the whole deposit, paperwork, ect..all while we are still currently living in a different state. Plan for a baby at the end of the month. Plan for a move 20+ hours away. With a NEW baby on board. Also, having my fingers crossed that my husband can take leave to help move and help with the first week or two of the baby being here. So let's hope he doesn't have to ride the ship back, and can just drive all of us to Virginia himself. But one of my biggest stresses I think is weight. I am a yoyo weight person. Whatever they are called. I'm usually between 140-160, back and forth, etc. I weighed 175 before I got pregnant. Was so sick, I lost 10 pounds, and am now currently back up to 175. I am a week away from being 6 months prego, and I can't help but to stress about how much more weight I'm going to gain. I got 200 pounds with my daughter, and I told myself I wouldn't do that with this one. But it looks like I'm right on that same track. I know this is a long post, and I thank you for whomever has taken the time out to read it all. Any advice on how to cope with anxiety? And stress about weight during a pregnancy? Should I be worried about hitting 200 pounds? How quickly do you lose the weight after? Idk why I stress so much about these things. But I'm human. Thank you again, in advance, for the responses. :-*