Showering does take a lot of energy. If you use O2, drape the hose over the shower curtain rod and use it in the shower. Use a shower chair so you can sit. A flexible and hand-held hose can also help. Leave the back of the curtain or door open for air and don't close the bathroom door. Have a chair waiting when you get out of the shower with a big terrycloth robe, so you can sit immediately and let the robe do most of the drying.

I answered above but here's some "extra"... I let the shower water get warm, then lean over and wash my hair. The portable oxygen unit is close by and the hose hanging from the shower door in case I fell I need it. I then wash my face and the rest of me fairly quickly and have a towel close by to do a quick dry. Then I put on the oxygen and terry robe (they're great!) and lay down for a few minutes while I dry. No problems.

Wear your oxygen in the shower. Put a showered chair in to sit on and dry off or just put on a terry robe instead of actively drying off

I'm the same way I do have a chair and wear my oxygen in the show and when I get out I put a robe on then dry off when I get more air and relax it helps some but still I hate the thought of a shower you are not alone

update for me I get in with my oxygen wash my hair rinse out sit on my chair use conditioner then soap up my body then stand up finish soaping and now i am ready to rinse everything head to toe sit and up and out then dry off and rest lotion up while sitting