Hello JACustomer/ Shelly,
You are right, alcohol does "take away" B vitamins, but too much of anything is not a good thing. One daily multivitamin will suffice, so long as his own doctor doesn't say anything to the contrary (always ask your own doctor before starting anything new). Dizziness from waking up can be from multitudes of reasons, from a bit of dehydration to low blood pressure to some vertigo...and absolutely when he sees his doctor it should be mentioned that he felt dizzy when he got out of bed.
The thing I worry about there is something called "orthostatic hypotension" and it means that your blood pressure drops when you get up. It can herald some problems with the way your body regulates blood pressure, and if it only happened once four weeks ago, I might believe he was just a bit dehydrated...but if this keeps happening, the sooner he gets to see the doctor, the better. Especially as he is on blood pressure pills, his dose may need some adjustment.
A TIA stands for Transient Ischemic Attack, and is essentially a tiny little stroke that does no seeming damage. But, enough of them (so it is postulated) can have some cumulative effects on memory. Here is more information: http://www.stroke.org/site/PageServer?pagename=TIA
Yes, I would speak to his doctor...and ask for a referral to a neurologist. That carotid bruit should be followed up as well; his cardiologist is the one to handle that and I hope he did. What you are seeing is frightening to you; I sense the unease you have. It is something that should be addressed and there are many potential causes.
I hope this was helpful,
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