still feeling dizzy?

Withdrawal from sugar can cause lots of symptoms, as can a change to low carb. There is an adaptation period. If your husband is lowering his carbs a lot, and doing a lot of physical labour, I'm not surprised he has a fuzzy head. I certainly had one when I started LC, without any drugs or physical labour. If he can take it easy for a few days, that would help. It will pass if his diet change is the reason. Also, many people have to lower their metformin when they lower their carbs, because their blood glucose will go down, sometimes quite quickly.

Is he drinking plenty of water? I try to drink 2 litres per day, just tap water, out of which I take one or two coffees a day (so that's 2 litres of fluids in total). Any other drinks are in addition to that.

Light-headedness and headachey feelings can be a result of going low-carb. Take plenty of fluids and it will soon go away. Make sure he's getting good portions of protein, which will give him energy over a longer time period than the instant hit of carbs.

Any further questions, please ask!

Viv 8)