Sucks huh? Been there, done that, bought the t-shirt.
With a little ingenuity, there should be no reason not to get in some good workouts.
I would do hardcore workouts at your gym friday, saturday and sunday, focusing on whatever it is that you can’t do when you are away.
During the week, focus on chin-ups and pull-ups. You can do a million different push up variations, and I don’t know anyone who thinks handstand wall push-ups are too easy. That covers back and shoulders, and chest (kinda), there’s tons of ab work you can do, and then use the equipment you have to get in some arm work.
Actually, based on what you said you have, you should be able to get in a good workout.
friday night (home gym) - chest and tri’s (shoulders maybe?)
saturday - legs
sunday - back and bi’s
monday - off
tuesday - pushups, wall pushups, any tri movement you can do
wednesday - chinups, chinups, and more chinups. any bi movement you can do
thursday - off (to prepare for your workout weekend)
This is all kind of straight-forward. You can figure out how to work your muscles… if you have to do 5 sets of 50 pushups instead of a proper chest workout, man, that’s way better than nothing.
Have some structure to your workouts and work your ass off. By the time your schedule changes and you are back at your gym full time, you’ll be stronger than ever.