Seeing your Gp might help you. You need to look after yourself..... Isn't seasonal affective disorder common in scandinavia due to lack of sun light over the winter? My Mum would tell you to eat more fruit and veg, eat chocolate and get heaps of exercise....thats her cure for everything!
Terje sounds like he needs to do something. a friend of mine made a memory box when her grandma was dying. They talked about things and taped stories and put things in it that her gran wanted her to have, and the found they laughed a lot doing it which helped both of them...., maybe Terje and his grandad could do something like that....I dunno....you know them so would have an idea whether its their sort of thing........its just a suggestion.