Vitamin D deficiency and low potassium?

I suffer from severe fatigue, double vision, muscle wastage and pain - my doc dodn't mention putting me on more vit d supplements or investigating why my levels have remained so low after taking such high supplemennts and sitting out in the sun!  Sometimes I despair with my doc! Ahhhh!

Before I read your second post I was already going to say: find a different doctor!!!!

Since you have not increased your vit D level after high dose supplements your doctor needs to think about why. Ideally he should have checked your vit D level immediately you had finished the course and then again a few months later. You only have good blood levels because there is enough in your tissues - if you were so low then he may not have given enough to fill up the "bucket" to leave some over to overflow. It does happen that even after a course the reservoir on the body isn't what they call replete - and you need more than other people might do.

It does sound as if you aren't making any by the skin route - you were sitting out between 11am and 3pm and with no sunscreen weren't you? Otherwise you are unlikely to make any - the sun's rays must strike the skin at a high enough angle to trigger the process and that only happens around midday between May and September. Even Factor 8 sunscreen reduces the amount made by over 90%! Less than 10% comes from diet unless youa re eating a lot of oily fish, half a pound every day for example. 

The other possibility is malabsorption of some sort - and that would account for the low potassium level too. 

But either way - it does need more than telling you to eat more bananas and green veg!