For some time now I've been getting terrible pain in my legs when walking and in my arms when lifting/carrying things. It's having a bad effect on my everyday life. I'm 59 years old and have been type 1 for 56 years. I had open heart surgery in February 2016. I swim 26 lengths 3 times a week. Muscle pain is much less when swimming than walking. Can anyone offer and help or advice please?