Hey- it'll get better! Try to fing something to do in the evenings- do a language course, find out about the university sports club.... or whatever interest you. Otherwise you'll end up going home and sitting infront of the TV feeling dissatified because all you do is work.
Besides- after a few weeks you'll get the hang of things and feel less stressed. Many of my colleauges have families too- how about other labs? Do you have any next door labs with new PhD students?? Go and start conversations with others about Manchester or what ever.