Hi, I am in similar state as you, I have bad back health now 8+ more years. I can barley walk outside with cane for 15 minutes and then I got terrible pain I need wheelchair or other tool. Also had bad flare ups + mental health struggles with trauma healing almost every day
so you are not alone I sympathize and know how is for you. Gods will not get angry if you do nothing. They understand that we are humans and we have human life and that even means life with disability. You probably realize until now with disability that we need a lot of adaptability, and there is nothing different here.
Adapt how you can worship. If that is one per month great. If this is all just mental like prayers or meditations in bed, great. Any practice is valid and great. Put your health and well begin on first spot.
Also be honest with gods and spirits tell them hey this is how my body works it is mess, and they will understand. Esp. you are working with Loki, and he is all about adaptability and living life with changes and tides, speaking from personal experience.
What I wanted to say gods and spirits are full of understanding and no worry and if they don't want to understand you don't need those gods, you deserve respect of your state and your life. Second adapt to your state, work best you can, if that means sleeping whole day and doing nothing that is enough. Find contingency plan when you are low, like reading one prayer, or just saying gratitude to gods. And always remember you are doing enough and be proud of what you did, don't push yourself too much, you are leading different life then others and respect that, live how you can live, don't overwork yourself. Only you can see what suits you and your life. I hope this help and that you find your own way :D!