I'm in your same boat, and have been for a few years. I love being a stay a home mom and I have two boys (2 yrs old and 10 mos old! Go figure!) My hubby has been a full time student and working full time since before my son was born (though I wasn't a SAHM until he was born) and we have just learned to cope with it. Thankfully for us, he graduates in the spring, so finally we will get more time with him then!
My advice is to get out there and try to put your self in situations where you can meet people (like taking trips to the park with your kids) and also make sure that you take full advantage of your time with your husband while is is at home. My hubby likes to study on campus if he can, but because that is something that would take him away form us even more than he always is, he studies at home as much as possible. I know that with two kid-tornados ravaging around the house it takes longer for him to get his work done, but at least I get to see and talk with him a while while he is doing it, and the kids get to see him and have more time with his as well, even if its just a 5 minute tickle break :-). Maybe you could talk to your hubby about staying home to study more often, so you get to see more of him. Saturdays are like sacred in our house. We ALWAYS go out and do something together with the kids, even if its just a trip to the grocery store or the mall. My other advice is to make sure that when your hubby is home you are actually doing things TOGETHER, not just sitting and watching TV or movies. I made this mistake last fall (because I figured he was so tired and just wanted to relax) so he was gone all day and then all evening the TV would be on and we were barely talking to each other. By the end of the semester I was more lonely than ever from the lack of communication and finally we figured out where we had been going wrong.
But yeah, I feel you... I'm totally in your same boat, so I know how it feels. Most of my friends and family live back east where we are from, and so since I can't see them, I spend a lot of time on the phone. If you can't get adult companionship in person, the phone is the next best thing. And sometimes, it sure is nice to have a little break for once in a while and talk to an adult!