I am in a similar position to you, I am disabled by my mental health to a severe degree and have a back problem (being medically investigated) that causes me chronic pain - to the point I cannot walk from the agony some days. If it is not my mind it is my body, it makes me breakdown sometimes, getting out on hikes and walks in the forest are highlights of my life, I LOVE getting out and being in nature. I fucking hate people like this who don't realise how they disgrace themselves, complaining about having to do awesome things people like you and I desperately wish we were able to do more.  I am sorry for the problems you have, it must be hard to deal with but you are not alone, I hope that is a comfort to you. I am having a bad day too.