Giddiness - NOT amateur radio

Since my stroke in 2013 I have felt giddy on my feet. In the last year this has got worse. Not only that, but all car driving has become more stressful. Even a 4 mile trip to Tesco fills me with dread. When I drive I seem to be OK. My wife says I am the same as ever and it is all in the mind. 45 mph feels like 70-80mph to me! I am aware I must drive slowly and this embarrasses  me.