Just thought I would update by saying after eating a banana and drinking some water this really didn't get any better. Then I had some strawberries and cream and hey presto back to normal - I know what to try now - fruit and fruit until some normality returns!
Really didn't expect to feel so bad as I don't consider myself to have a sweet tooth or eat a lot of sugar - I guess somewhere along the line I was wrong!
With being a SAHM to two toddlers, I can't afford big incapacitating dizzy spells!