I am currently in the same boat as you...but my situation may be a bit different because I completed my undergrad/master's research, and now I am waiting to start a PhD program at a different institution. If you are continuing your research at the graduate level with the same lab from undergrad, then I'd advise to focus on that during this "lame duck" phase: not sure what your area of research is, but having a large sample size for data analysis and working out the kinks in the lab/experimental design will save you a LOT of stress down the road. Maintain your sanity by visiting friends on weekends, traveling [if you can], reading non-science books (highly recommend "The Way of the Wolf"), and getting into a gym routine. You could also make some money by becoming a private tutor. This time period really does suck, but it's all about making these next few months less difficult and doing whatever you can to get out of the house.