Does SAD only affect people living in places with little sun

I live in Crete, Greece. Recently, for more than a month now, the weather has been awful with little sunshine and lots of rain. For the past few weeks I've been feeling so tired and lethargic, sleeping more than 10 hours at night and again for an hour or so after lunch. I had an attack of the flu 4 weeks ago which really knocked me for six. Then I happened to mention my tiredness to an English friend, who said that I could be a SAD sufferer - something I'd never heard of. I decided to check it out and found this website. So many of the symptoms seem familiar; I've put on 10 kilos since December and I feel too tired to get on with chores around the house. Everything seems so difficult. Does this mean I'm SAD? If so, what can I do to relieve the symptoms? I saw the ads for lightboxes etc. but I can't get hold of anything like that here. Can I just use brighter lighting in the house? And if so, what?

Julie, thanks for your reply. Can you believe this? Yesterday was a gorgeous sunny day so I spent time in the morning walking my dog. It's also a beautiful bright morning today so I did the same. Yesterday, I felt much better and today I feel positive about handling the mundane jobs about the house. As you say, it's possible that I'm not a SAD sufferer but the sun really does make you feel good! I'll take steps to ensure that I get as much light as possible. The houses here all have shutters over the windows which I have to close when it rains because the rainwater comes in and also my husband insists on closing them at night so I have to open them all the minute I get out of bed. If, by making sure I get enough light, I feel better, then that's what I'll do. Again, thanks.