Gyms are full of over-stimulation. Try to find a time when the gym is not so busy. Avoid the weight area. Plates, equipment slamming, and more can easily be too much. The sharp sound of metal clanging is a serious stimulation.

Unless you have a specific fitness objective for a job or endeavor, you can do everything you need to do at home.

Look up TRX. It was designed by Navy Seals who need to keep fit in a submarine.