If worse comes to worse invest in bands in addition to bodyweight exercises. Of course, no exponential increase in size or strength will occur until weight progressive overload training is continued.
Here's some exercises you could do to maintain and prevent muscle atrophy, of course that and your diet is where it should be

...
1. Push ups at different angles, arm width and hand positions.
2. Chin ups, push ups, burpees, bridges, crunches.
3. Climbing stairs hitting different areas of your quads.
4. Jumps, squats, thrusts, etc.
Good luck and hope you get the guys who jacked your weights lol.